This page presents a generative discussion of the 1932 doctoral dissertation by Rabbi Joseph Baer Soloveitchik, focusing on the complex epistemology and metaphysics of Hermann Cohen, a central figure in the Marburg school of neo-Kantianism. The components here explore how pure thinking generates and defines the structure of being, specifically through a lens of mathematical-scientific idealism that rejects empirical sensation as a starting point for knowledge. Soloveitchik critically analyzes Cohen's "logic of origin," which replaces the traditional "given" reality with a self-generating intellectual process where objects are products of thought rather than independent entities. The scholarly introductions below contextualize the work, revealing that while Soloveitchik utilized Cohen's dialectical methods, he ultimately found Cohen’s scientific monism insufficient to explain individual consciousness or emotional reality. The units here elucidate how Soloveitchik's dissertation serves as an academic bridge between secular German philosophy and the intellectual development of an influential Jewish theologian. 

I received my rabbinic ordination in 1973 from the Rav after studying in his Talmud and Codes shiur for four years.

Above: Two short video overviews and a longer deep dive discussion into the dissertation.

This page presents discussions of a 1932 doctoral dissertation by Rabbi Joseph Baer Soloveitchik, focusing on the complex epistemology and metaphysics of Hermann Cohen, a central figure in the Marburg school of neo-Kantianism. The presentations explore how pure thinking generates and defines the structure of being, specifically through a lens of mathematical-scientific idealism that rejects empirical sensation as a starting point for knowledge. Soloveitchik critically analyzes Cohen's "logic of origin," which replaces the traditional "given" reality with a self-generating intellectual process where objects are products of thought rather than independent entities. 

Below my foreword introduction to my unpublished translation of the work from German contextualize the thesis, revealing that while Soloveitchik utilized Cohen's dialectical methods, he ultimately found Cohen’s scientific monism insufficient to explain individual consciousness or emotional reality. The collection of material here serves to explain how to understand the dissertation as an academic bridge between secular German philosophy and the intellectual development of a major Jewish theologian. 

Note: At the request of Soloveitchik's family I have not published my English translation of the German thesis.

Prologue

(Below is my introduction to my unpublished original translation to English of the 1932 Berlin doctoral dissertation of Joseph Baer Soloveitchik. In this discussion I provide context for the reader for the life and personality of Rabbi Soloveitchik, and for the work of Hermann Cohen, whose philosophical writings are the subject of the dissertation. 

For context and background on the Rav, I refer first to the essay by the businessman and scholar Manfred Lehmann, “Re-writing the Biography of Rav Soloveitchik,” He summarizes the state of our knowledge succinctly, edited slightly here): 

…in the Encyclopedia Judaica, references to his childhood and early manhood are very sketchy. It reports that "until his early twenties, Soloveitchik devoted himself almost exclusively to the study of Talmud and halachah (Jewish law)."  

As to his secular education, it reports that "in his late teens Soloveitchik received the equivalent of a high school education from private tutors, and at the age of 22 he entered the University of Berlin. He majored in philosophy and was attracted to the neo-Kantian school. In 1931 he received his doctorate for his dissertation on Hermann Cohen's epistemology and metaphysics ... In 1932 he and his wife emigrated to the United States."  

…A curriculum vitae I have, written by the Rav and signed in his own hand, gives a totally different biography:  

"I, Josef Solowiejczyk, was born February 27, 1903, in Pruzna, Poland. In 1922 I graduated from liberal arts `Gymnasium' in Dubno. Thereafter I entered in 1924 the Free Polish University in Warsaw where I spent three terms, studying political science. In 1926 I came to Berlin and entered the Friedrich Wilhelm University. I passed the examination for supplementary subjects at the German Institute for Studies by Foreigners and was then given full matriculation at the University. I took up studies in philosophy, economics and Hebrew subjects.  

I wish to express my sincere and hearty thanks to my highly honored teachers, "Geheimrat," Professor Dr. Heinrich Maier and Professor Dr. Max Dessoir. Furthermore, my thanks go to Professor Dr. Eugen Mittwoch and Professor Dr. Ludwig Bernhard."  

We here have evidence that the Rav studied at the University of Warsaw…. His father Rav Moshe Soloveitchik, lived in Warsaw and headed the Tachkemoni School there. It would, therefore, seem that the Rav divided his time between secular studies and Talmudic studies in private with his father.  

He spent almost six years in Berlin, contrary to all available biographies, which say that he wrote his doctoral dissertation in 1931 and received his degree the same year. Instead, he passed his oral doctor's examination on July 24, 1930, but graduated with a doctorate only on December 19, 1932….  

While the biographies only mention his studies in philosophy, we now know three additional secular subjects he studies: political science in Warsaw; and economics and Hebrew subjects in Berlin.  

It is reported that the Rav would have liked to write his dissertation on Maimonides and Plato, but since no experts in these subjects were available in Berlin, he chose a field of pure philosophy, tempered with mathematics.  

His chosen field was the philosophy of Hermann Cohen, the famous Jewish philosopher of the so-called neo-Kantian school of the University of Marburg. For this study his main teacher was Professor Heinrich Maier, the great expert in Cohen's philosophy at the time. Maier's curriculum vitae shows a great variety of philosophical subjects, which he had mastered before specializing in Cohen's philosophy. As a result, the Rav's dissertation of 110 pages deals largely with Professor Heinrich Maier's own interpretations of Cohen, rather than with Cohen himself. Its title is as esoteric as its contents: "Das reine Denken and die Seinskonstituierung bei Hermann Cohen."  

In going through this dissertation it struck me that not a single Jewish word or source appears in it. It was almost as if the Rav for the purpose of his thesis had cut himself off from all the deep Jewish studies of his previous years.  

This is particularly surprising because Hermann Cohen was a staunch defender of Judaism and published books on Jewish themes, such as "Love for One's Neighbor in the Talmud." He glorified the Jewish concept of history as G-d's way to achieve unity of mankind and to establish the Kingdom of G-d on earth. The Rav could have found, therefore, even in Cohen's philosophy, strong Jewish elements.  

While Professor Heinrich Maier was a pure philosopher, Professor Ludwig Bernhard's special field was political science, and Professor Max Dessoir was a specialist in aesthetics and the history of art. These two seem to have had little connection with the Rav's thesis. The more interesting personality among his teachers was Professor Eugen Mittwoch (1876-1942), the only Jew among them.  

Professor Mittwoch was classified in German academic circles as an "Orientalist," but he had a fine Jewish upbringing and education and was strictly Orthodox. He studied at the Rabbinerseminar in Berlin and devoted much of his life to charitable work in the Jewish communities in Germany. He was one of the first German Jews to master modern Hebrew. He took a special interest in the Falashas of Ethiopia, whose existence had only been discovered at the end of the 19th century.  

He became a specialist in Ethiopic languages – which in a unique way saved his life. For when Mussolini occupied Ethiopia – then called Abyssinia – in 1935, he needed an expert in the local languages. Professor Mittwoch was the right man for him, so Mussolini personally requested of Hitler that the professor, despite being a Jew, should be spared so that he could help Italy in its colonial policies!  

All this was told to me by his grandson, Michael, who went briefly to school with me in England in 1939 and whom I visited some years ago in Kibbutz Lavi in Israel.  

When the Rav's dissertation was approved by his professors, each one had to express in a handwritten note their opinion of his work. Professor Dessoir classified his work as "gut" ("very good"), and Professor Mittwoch noted that the Rav had been examined in the prophets Isaiah, Jeremiah and Ezekiel; the Song of Deborah; and Hebrew grammar. Professor Mittwoch's verdict: "sehr gut." In 1932 the Rav graduated with the Latin mark magna cum laude, which is a shade below summa cum laude.  

I have copies of a great number of communications exchanged by the Rav with the University authorities starting on May 9, 1930, when he reported that his dissertation and his University work were finished and asked that he be allowed to submit his dissertation and undergo an oral examination. On the same day, the dean of the University agreed to receive the Rav's application for oral examinations.  

The Rav had to affirm in writing that the dissertation was written without outside help and that it had not been published elsewhere. At this point the Rav lived in Berlin at the Pestalozzistrasse 105. On June 30 the dean turned to Professor Heinrich Maier with the request to fix a date for these examinations. The oral examinations took place, and on July 24 all of his professors gave their written approval.  

On May 1, 1931, a letter – 100 percent in the Rav's own handwriting -- pleads "financial reasons: why the dissertation could not yet be printed and requested a delay of one year. He also expresses his intention to "amplify" his thesis. On January 7, 1931, the dean writes the Rav – who now lives in Vilna at Kijowsy 4/29 – that the delay has been granted until January 1, 1932.  

On November 1932, the Rav, already living in New York, signed a printed affidavit committing himself to honoring the doctoral diploma and protecting it from any dishonor and that "he will always seek and practice truth without regard to exterior considerations," He applied for a waiver of the requirement that he personally appear in Berlin to collect his diploma, and by letter of December 5, 1932, the dean – writing to the Rav at 435 Ft. Washington, New York – approved this request. Finally, the diploma, written in Latin with the date December 10, 1932, was executed.    

These additional sources below give the reader further context to the dissertation

The University  

(The Berlin University. From Wikipedia)  

Humboldt University of Berlin (German: Humboldt-Universität zu Berlin, abbreviated HU Berlin) is a public research university in the central borough of Mitte in Berlin, Germany. It was established by Frederick William III on the initiative of Wilhelm von Humboldt, Johann Gottlieb Fichte and Friedrich Ernst Daniel Schleiermacher as the University of Berlin (Universität zu Berlin) in 1809, and opened in 1810, making it the oldest of Berlin's four universities. From 1810 until its closure in 1945, it was named Friedrich Wilhelm University (German: Friedrich-Wilhelms-Universität). During the Cold War the university found itself in East Berlin and was de facto split in two when the Free University of Berlin opened in West Berlin. The university received its current name in honor of Alexander and Wilhelm von Humboldt in 1949.  

It was regarded as the world's preeminent university for the natural sciences during the 19th and early 20th century, as the university is linked to major breakthroughs in physics and other sciences by its professors, such as Albert Einstein. Past and present faculty and notable alumni include 57 Nobel Prize laureates (the most of any German university by a substantial margin), as well as eminent philosophers, sociologists, artists, lawyers, politicians, mathematicians, scientists, and Heads of State; among them are Albert Einstein, Karl Marx, Friedrich Engels, Otto von Bismarck, W. E. B. Du Bois, Angela Davis, Arthur Schopenhauer, Georg Wilhelm Friedrich Hegel, Walter Benjamin, Max Weber, Georg Simmel, Karl Liebknecht, Ernst Cassirer, Heinrich Heine, Max Planck and the Brothers Grimm.  

The Subject of the Dissertation: Who was Hermann Cohen?  

(From the Stanford Encyclopedia of Philosophy, https://plato.stanford.edu/entries/cohen/)  

Hermann Cohen (b. 1842, d. 1918), more than any other single figure, is responsible for founding the orthodox neo-Kantianism that dominated academic philosophy in Germany from the 1870s until the end of the First World War. Earlier German philosophers finding inspiration in Kant tended either towards speculative, metaphysical idealism, or sought to address philosophical questions with the resources of the empirical sciences, especially psychology. In contrast, Cohen’s seminal interpretation of Kant offered a vision of philosophy that decisively maintained its independence from empirical psychology, without at the same time simply lapsing back into uncritical metaphysics. Cohen brought these attitudes to bear on a wide range of topics, writing systematically about epistemology, philosophy of science, ethics, law, political theory, and aesthetics. His anti-psychologism became a defining commitment not only of the Marburg School of neo-Kantianism, founded by Cohen himself, but of orthodox neo-Kantianism more generally. Indeed, that commitment ultimately defined the philosophical context from which, in the early twentieth century, both phenomenology and logical positivism emerged.  

No less significant than his influence on academic philosophy, Cohen was his generation’s preeminent German-Jewish public intellectual and religious philosopher. His philosophical ethics and political theory provided the foundation for a non-Marxist, Kantian democratic socialism that informed his more popular and topical writings. He argued publicly for universal suffrage and for the rights of workers to organize democratically-constituted collectives. He also saw deep points of connection between ethics and religion, and developed a view of Judaism as a fundamentally ethical system of belief and practice. He argued that monotheism was the historical source of the idea of universal ethical laws, and thus that Judaism offered the world its first model of a universalist morality. This view of Judaism’s ethical significance ultimately informed Cohen’s public defense of the Jews’ place in Germany not only against anti-Semitic attacks, but also against the arguments of early twentieth-century Zionists. However, Cohen’s influence on Jewish thought extends far beyond debates within Imperial Germany: his late religious writings inspired a broad renewal in twentieth-century Jewish ethics and philosophy of religion.  

Soloveitchik’s Assessment of Cohen  

Professor Mark Smilowitz has assessed the impact of this dissertation in his article in Journal of Jewish Thought & Philosophy [29 (20 21) 262–296]. “The Boundaries of Knowledge: The Unity of Rabbi Joseph B. Soloveitchik’s Jewish Philosophy in Light of His Doctoral Dissertation”.  

In a personal communication Professor Smilowitz observed, “My biggest surprise reading the dissertation was how strongly he disagrees with some of Cohen's most fundamental ideas. Before reading it I had assumed he was mainly a Cohen sympathizer, despite some negative portrayals of Cohen in some of his writings. Even after reading the dissertation, I cannot deny the evidence from some of his work that in certain ways he remains a Cohen sympathizer. It seems that despite all the faults he found in Cohen's system, there's something about Cohen the Rav still finds compelling. Working out the boundary lines between what he embraces and what he rejects, and then assessing if this revised, half-Cohen system that he's left with is viable, is a job still waiting to be done. I suspect that the Rav looked at Paul Natorp as someone who successfully revised Cohen, which I hinted in my paper. The doctorate I am currently writing touches on what the Rav got from Natorp, so I hope I can shed some light on this issue.”  

The relationship of Soloveitchik to Cohen was in fact an ironic one given the overall oeuvre of writings of Cohen. Contextualizing who was Cohen within the European philosophical communities - Jewish and Christian, Robert Erlewine says, “At the very moment Cohen was trying to articulate the centrality of Judaism to the essence of the West, numerous theologians and scholars attempted to downplay, if not eliminate outright, Judaism from Germany’s culture”.  

Some bells went off when I read this. Of course, Soloveitchik knew how positive Cohen was about German culture and its relationship to Jewish culture. I do wonder if the advisors who sent the Rav to work on Cohen want him to work out this knotty issue. But then he selected instead a safer set of Cohen problems to write about.  

Erlewine elaborates further, “Cohen was a towering figure at the time Soloveitchik wrote his dissertation (he had passed away). It is very easy—and, indeed, was often done by Jewish thinkers writing in the wake of the Nazis—to present Cohen’s engagement with German culture as deluded. But at the time he was writing the rise of the Nazis was by no means inevitable. Cohen was a towering—albeit controversial—philosopher influential in a range of different issues, but particularly philosophy of science, so it makes sense that Soloveitchik would have worked on him. Cohen methodologically grounded a lot of his later culture-war writings (where he presented Judaism as not only compatible with German culture but as constituting a vital part of it), but his Neo-Kantian method was widely acknowledged and disputed and its influence on Soloveitchik and so many other Jewish thinkers in the 20th century (was not entirely clear). Cohen was a towering intellectual figure at the time.  Moreover, Soloveitchik’s attention to Cohen also makes sense because Soloveitchik’s own work—particularly in Halakhic Mind—evinces a significant debt to Cohen’s disciple Paul Natorp (who comes to later diverge with Cohen on a host of issues). 

Professor Robert S. Schine wrote to me regarding his book, “Rabbi Soloveitchik’s dissertation on Cohen is part of the Jewish/philosophical reception of Cohen in the years just before the Shoah, which of course annihilated the matrix from which Cohen’s thought grew and either murdered off or exiled his Jewish readers. It also resulted in a bifurcation: there were those who read Cohen as a part of the history of Neo-Kantianism, with little attention to his significance as a Jewish thinker, and those, most the refugee scholars, who read him as a Jewish thinker with little attention to his place in the history of German philosophy. Both Frederick Beiser’s recent intellectual biography of Cohen and Samuel Moyn’s and my anthology seek to show a more holistic view.  

“That Jewish/philosophical reception includes a number of books, e.g. by Walter Kinkel, Jakob Klatzkin, Sinai Ucko, and of course the essays that I translated in Part Three of our anthology. These would make up part of the context in which to view Soloveitchik’s dissertation.” 

Professor Paul E. Nahme provides further context for the research of the dissertation.  

With its scientific worldview, Hermann Cohen’s Marburg school of neo-Kantianism provided a theory of normativity that sought to recuperate the reputation and role of philosophical method as arbiter of public discourse. Since Germany’s failed liberal revolution of 1848, philosophical idealism had been associated with a weak and ineffectual liberal political project. Neo-Kantianism sought to redeem idealism as a scientific and non-metaphysical philosophy. Thus, the natural scientific model of “experience” sketched by Cohen’s groundbreaking Kant’s Theory of Experience (1873) provided neo-Kantian philosophy with a rigorous idealist basis for its account of human knowledge as a system of a priori categories and lawful cognitive models for mapping the world. Through Cohen’s continued reinterpretation of Kant throughout the 1880s and the development of his own system of philosophy in the early 1900s, he helped popularize a neo-Kantianism that emphasized the construction and critique of knowledge (Erkenntniskritik), the rigors of science, and the role of philosophy as a coherent map of both concepts and values.  

An Appreciation  

I conclude this foreword with a brief appreciation of my great teacher.  

In the fall of 1969, as a college senior, I started four years of learning in Rabbi J. B. Soloveitchik's Talmud shiur. In my family we venerated the Rav above all other rabbis. We spoke of him with the utmost reverence that one would bestow only upon a truly saintly man.  

I received in those four years so much from the Rav: a methodology of learning, a theology of Judaism and, above all, a secret of pedagogy.  

Let me explain briefly this last point. The Rav would sometimes in an occasional moment of surprising self-reflection refer to himself as a "simple melamed," just a teacher of beginners. That statement puzzled me. Surely the Rav was the greatest sage of our generation. How could he represent himself in this ordinary way?  

One day I accidentally discovered what he meant. We convened on the fourth-floor classroom for our shiur – about to begin studying a famous discussion in Tractate Shabbat. That day I was using a Talmud volume from a small Talmud set that my uncle had used when he studied in the Rav's shiur many years earlier, in the fifties. I found interleaved in this book a page of my uncle's notes (i.e., Rabbi Noah Goldstein, my dad's brother) from the Rav's discourse on this discussion fifteen or twenty years earlier.  

As we started reading the text, the Rav began to perform the magic that he was so good at. He made it seem to us all as if he was looking at the text for the very first time. He made every question he raised appear as if he was discovering a problem afresh. He made every answer and explanation that he examined in Rashi or the Tosafot appear to us as if it was new to him – a complete surprise.  

The Rav dramatically unfolded a complex and intricate exposition of the discussion – and each stage of the discourse seemed so new and alive. Yet as I followed along and I read in my uncle’s notes, I saw that the Rav was repeating each and every element of the shiur exactly as he had given it years before, insight by insight, question by question and answer by answer. He had me convinced that he had just discovered every element of his learning. Yet I had proof in front of me to the contrary.  

I saw that day how the Rav had the ability to make every act of learning a new, exciting and living revelation. I have striven to emulate him ever since to replicate this ability and to achieve as a learner and as a teacher some small element of this revelation.  

Hanging over my desk as I originally wrote this appreciation of my teacher was a quotation from the great German Poet Rainer Maria Rilke, "If the angel deigns to come it will be because you have convinced her not by tears but by your humble resolve to be always beginning: to be a beginner."  

To conclude, obviously, the work in this volume cannot adequately reflect the great skills of pedagogy of my teacher. A PhD dissertation by definition is a rigorously structured exercise in research and analysis that demonstrates to the advisors and other readers of the thesis that the student has command of his discipline and is ready to go out into the world and pursue further research and create new knowledge. It is the “license” for a scholar to become a teacher and researcher at a college or university.  

This dissertation which I translated (but did not publish) is a focused methodical analysis of issues of great philosophical import. It is not a document that can be read and understood easily by an average lay person, even one with a higher education. The work demonstrates the writer’s ability to clearly state and examine deep philosophical issues. It does not illustrate what I described above – the amazing pedagogic talents of the masterful classroom teacher and charismatic public lecturer that Rav Soloveitchik was. It demonstrates instead the deep critical analytical skills of a genius of Jewish and philosophical learning. 

Pure Thinking and the Constitution of Being: A Critical Analysis of Joseph B. Soloveitchik's Dissertation on Hermann Cohen

Monograph Introduction

In the intellectual landscape of twentieth-century thought, few figures cast as long a shadow over Jewish philosophy and religious life as Rabbi Joseph Baer Soloveitchik, known to generations of students and followers as "the Rav." Yet, before he became the preeminent leader of Modern Orthodoxy in America, Soloveitchik was a doctoral candidate at the Friedrich Wilhelm University in Berlin, deeply immersed in the regnant philosophical currents of his day. His chosen subject was the epistemology of Hermann Cohen, the celebrated founder of the Marburg School of neo-Kantianism and his generation's most eminent German-Jewish public intellectual. The product of this intense academic engagement was Soloveitchik's 1932 dissertation, Das reine Denken and die Seinskonstituierung bei Hermann Cohen (Pure Thinking and the Constitution of Being in Hermann Cohen’s Work).

This monograph provides a scholarly analysis of Soloveitchik's dissertation, a text that is at once a rigorous exercise in pure philosophy and a critical window into the formation of one of the century's great Jewish thinkers. This analysis will demonstrate that the dissertation represents a profound and early articulation of Soloveitchik's philosophical method, marked by a systematic and incisive critique of Cohen's "scientific idealism" and a decisive rejection of his epistemological monism. By unpacking the dissertation's core arguments and situating it within its proper historical and philosophical context, we can see it not as mere juvenilia, but as a foundational document in which the seeds of Soloveitchik's most enduring philosophical commitments were first sown.

1.0 Historical and Intellectual Context

To fully appreciate the depth of Joseph B. Soloveitchik's philosophical intervention, one must first understand the unique biographical and intellectual circumstances that shaped his dissertation. The academic environment of pre-Shoah Berlin, a vibrant and complex hub for Jewish thinkers engaging with German culture, provided the crucible in which a revered Talmudic scholar was forged into a formidable philosopher. It was against this backdrop that Soloveitchik would turn his powerful analytical mind to the work of Hermann Cohen, the standard-bearer of a revitalized Kantian idealism.

1.1 Soloveitchik in Berlin: The Making of a Philosopher

Contrary to early biographical sketches that depicted his secular education as a brief interlude, research by scholars such as Manfred Lehmann, drawing on Soloveitchik's own curriculum vitae, reveals a more extensive and deliberate course of study. Born in Pruzna, Poland, in 1903, Soloveitchik graduated from a gymnasium in 1922 before studying political science for three terms at the Free Polish University in Warsaw. In 1926, he moved to Berlin and enrolled at the Friedrich Wilhelm University, where he pursued studies in philosophy, economics, and Hebrew subjects for nearly six years.

His primary academic advisors for his dissertation were Professor Dr. Heinrich Maier and Privy Councilor Professor Dr. Max Dessoir, with Professor Dr. Eugen Mittwoch also serving on his committee. The choice of Professor Maier was philosophically determinative, effectively situating the dissertation within a specific German academic debate. As Manfred Lehmann notes, Maier was "the great expert in Cohen's philosophy at the time," and consequently, the work engages so heavily with Maier's interpretations that it becomes as much a commentary on Cohen's reception as on Cohen himself. This decision to focus on a purely philosophical engagement is underscored by a striking feature of the dissertation: its complete absence of Jewish sources. As Lehmann observes, "it struck me that not a single Jewish word or source appears in it... It was almost as if the Rav for the purpose of his thesis had cut himself off from all the deep Jewish studies of his previous years," a decision that underscores Soloveitchik's intent to engage in "pure philosophy" devoid of Jewish particularism.

1.2 The Intellectual Milieu: Hermann Cohen and the Marburg School

Hermann Cohen (1842-1918) was, as the Stanford Encyclopedia of Philosophy describes him, the figure most responsible for "founding the orthodox neo-Kantianism that dominated academic philosophy in Germany from the 1870s until the end of the First World War." At the heart of his project was a rigorous "scientific idealism," a term Soloveitchik himself uses to characterize Cohen's system. As Mark Smilowitz outlines in his analysis of the dissertation, Cohen's idealism is a direct response to the Kantian problem of the "thing-in-itself"—the unknowable reality behind our perceptions. In order to save knowledge from skepticism, idealism refutes realism by denying absolute being to objects, asserting instead that they are fundamentally a product of thought.

This was not just any thought, but specifically "mathematical-scientific thinking." As scholar Paul E. Nahme explains, the broader neo-Kantian project sought to redeem idealism as a "scientific and non-metaphysical philosophy" grounded in the formidable successes of the natural sciences. For Cohen, Kant's primary question was, "How is science possible?" His answer was that the objects of our experience are constituted from the outset by the same mathematical and scientific logic that the scientist later makes explicit. For Cohen, as Soloveitchik concisely summarizes in the dissertation, "Mathematical thought is really that thought which constitutes knowledge and being."

It was against this formidable backdrop of scientific idealism, which sought to equate all of being with the products of mathematical reason, that Joseph B. Soloveitchik would level his comprehensive critique.

2.0 The Central Critique: Deconstructing Cohen's Scientific Monism

The core of Soloveitchik's dissertation is a systematic dismantling of Hermann Cohen's "scientific idealism." Far from a simple exposition, the work is a critical dissection that exposes the internal contradictions and limitations of Cohen's monistic epistemology. This section will analyze the foundational pillars of Soloveitchik's critique, focusing on his deconstruction of Cohen's central concepts: the nature of scientific thinking, the principles of origin and unity, and the formulation of consciousness.

2.1 The Limits of the "Law-Scientific Character of Thinking"

Soloveitchik's primary objection, articulated in the first chapter of his dissertation, targets the foundational premise of Cohen's system: the equation of all logical thinking with "mathematical-scientific thinking." Soloveitchik argues that this equation, which privileges the quantitative and law-based methods of physics and mathematics, problematically excludes other valid and essential forms of knowledge.

By elevating the mathematical-physical model to the sole arbiter of reality, Cohen's system effectively banishes the descriptive, biological, and humanistic sciences (Geisteswissenschaften) from the realm of legitimate logical inquiry. Soloveitchik's critique highlights the fact that disciplines like systematic botany or geography, which rely on qualitative description and individualizing abstraction, cannot be accommodated within a framework that recognizes only generalizing, law-based explanation. This rejection of the supremacy of the "law-scientific method" represents an early and forceful stand against the positivist tendencies inherent in Cohen's system, laying the groundwork for what would become Soloveitchik's own "epistemological pluralism."

2.2 The Unraveling of "Pure Thought": Origin and Unity

In his second chapter, Soloveitchik turns his critical lens to the very engine of Cohen's idealism: the concept of "pure thought" and its grounding principles of "unity" and "origin" (Ursprung). Cohen's Ursprung represents a radical neo-Kantian attempt to ground knowledge without recourse to either the psychological consciousness of older idealisms or the Kantian "given" that he sought to overcome. For Cohen, thinking must begin with itself, generating its own objectivity and its own starting point.

Soloveitchik dissects this concept and reveals an inherent antinomy at its core. The demand for "purity" in thought presupposes a definitive beginning, yet the demand for "lawfulness" (which requires that every element be deduced from a prior one) logically excludes a first element. Cohen attempts to resolve this contradiction with the "infinitesimal method" and the concept of infinity, arguing that the cognitive process is an infinite regress without a true starting point. Soloveitchik's analysis exposes this as a philosophical sleight of hand—an attempt to overcome a fundamental contradiction by postponing its beginning to an "infinite distance." This solution, he argues, ultimately testifies to the "powerlessness of cognition to defend itself against the difficulties arising from the antinomies" it has generated.

2.3 Consciousness without a Subject

The critique extends to Cohen's formulation of consciousness in Chapter Three. Soloveitchik carefully distinguishes between Cohen's concept of "pure consciousness"—the unity of thought itself—and the self-consciousness of a subjective knower. In Cohen's system, "pure thought" is a reality-free, subjectless process; it is not the product of a mind but is rather the principle that constitutes both mind and world.

Soloveitchik argues that this model ultimately fails because it cannot account for the subjective side of knowledge. The system runs into a fatal contradiction when thinking must critically examine itself. In such an act, thought must necessarily split into a subject (the critical thinker) and an object (the naive thought being examined). Cohen's subjectless model cannot sustain this division without collapsing into the very self-consciousness he seeks to avoid. This failure to adequately ground the subjective experience of knowing reveals a critical vulnerability in the foundation of Cohen's idealism.

These foundational critiques of Cohen's system—its restrictive monism, its unstable concept of origin, and its inadequate theory of consciousness—form the basis for Soloveitchik's more thematic analyses, which will now be examined in detail.

3.0 Thematic Failures in Cohen's Epistemology

Soloveitchik's critique culminates in his exposure of three thematic failures where Cohen's abstract system proves incapable of accounting for the concrete world: the irreducible particularity of the individual, the unresolved status of empiricism, and the unstable conceptual triad of Being, Task, and Reality. His analysis demonstrates that Cohen's attempt to reduce all of reality to the product of mathematical-scientific reason fails when confronted with the necessary components of knowledge itself.

3.1 The Problem of the Individual and Sensation

A central thread running through Soloveitchik's analysis, particularly in chapters Four and Seven, is the inability of Cohen's system to adequately account for "knowledge of particular, individual things." Because Cohen's idealism privileges the general, the universal, and the conceptual law, it has no coherent mechanism for grasping the unique and concrete individual. The individual, in this framework, can only be understood as an instance of a genus, a mere specimen of a broader logical form, rather than a distinct entity in its own right.

This failure is directly connected to the problem of sensation. Cohen's system, built on the pure, spontaneous activity of thought, cannot logically integrate the data of experience derived from sensation. As Soloveitchik argues, this "passive knowledge from sensations" is inherently individual, qualitative, and resistant to being dissolved into the quantitative, law-based abstractions of mathematical physics. The world of colors, sounds, and textures—the very world given to us through the senses—remains an alien and unassimilable element, revealing a fundamental disconnect between Cohen's idealized world of pure thought and the world of lived experience.

3.2 An Unstable Foundation: Being, Task, and Reality

Soloveitchik's most comprehensive critique, constructed across chapters Five, Six, and Seven, targets the core conceptual triad of Cohen's epistemology: the Task, Being, and Reality. His analysis reveals these concepts to be unstable, internally inconsistent, and ultimately insufficient for the work they are meant to perform.

• The "Task" (Aufgabe): Soloveitchik scrutinizes Cohen's concept of knowledge as an infinite "Task," an eternal process of becoming. This concept is Cohen's attempt to resolve the tension inherent in his system between the dualism of synthesis and analysis—the analytical need for fixed, determinable concepts and the synthetic demand for a continuous, generative process of thought. Soloveitchik argues that this perpetual incompleteness is a necessary but philosophically ungrounded mechanism, required only to keep the idealist system in motion and prevent its collapse into stasis.

• "Being": Soloveitchik argues that Cohen's theory of "Being" is fatally flawed. By reducing Being to "mathematical-and scientific being," Cohen empties the concept of its substance. Soloveitchik draws a powerful analogy, comparing Cohen's error to the fallacy in the ontological proof of God. Just as that proof mistakenly treats existence as a predicate of substance, Cohen's theory wrongly conflates Being with its conceptual carrier (in this case, the infinitesimal number), dissolving the former into a mere mathematical abstraction.

• "Reality": Finally, Soloveitchik demonstrates that Cohen's concept of "Reality" fails to solve the very problem it was designed to address: the challenge of empiricism. Instead of bridging the gap between pure thought and the concrete world, Cohen's "Reality" remains a world of "physical abstractions"—a realm of "atomic complexes, energy quanta and movements." It is not the tangible world of experience but a theoretical construct of physics, leaving the idealist system sealed off from the empirical data it claims to explain.

These incisive critiques, formulated with philosophical rigor early in his career, would not remain confined to his doctoral dissertation but would have a lasting impact on Soloveitchik's own distinguished philosophical trajectory.

4.0 Legacy and Significance

Joseph B. Soloveitchik's Berlin dissertation is far more than an impressive piece of juvenilia; it is a foundational document that reveals the deep structure of his philosophical commitments—commitments that would endure and evolve throughout his long and influential career. The rigorous intellectual encounter with Hermann Cohen was not merely a requirement for a degree but a formative experience that shaped the very architecture of his later thought. This section assesses the long-term impact of this early engagement, situating the dissertation within both Soloveitchik's own oeuvre and the broader landscape of 20th-century Jewish thought.

4.1 Enduring Philosophical Themes in Soloveitchik's Oeuvre

As philosopher Mark Smilowitz has argued, two central philosophical positions adopted by Soloveitchik in his dissertation continued to inform his Jewish philosophical writings for decades. These positions, forged in the critical analysis of neo-Kantianism, became foundational pillars of his own unique theological and philosophical vision.

• Epistemological Pluralism: This stance emerges as a direct outcome of his "rejection of Cohen’s scientific monism." Having dismantled Cohen's attempt to reduce all valid knowledge to a single, mathematical-scientific model, Soloveitchik embraced a pluralistic view of knowledge. This conviction would ground his consistent use of the dialectical method in later works, allowing him to explore the distinct and often conflicting truths of scientific reason, halakhic logic, and existential faith without collapsing one into the other.

• The Eternal Mystery of the Unknown: Smilowitz identifies a second enduring theme that Soloveitchik adapted from Cohen's disciple, Paul Natorp. This idea—that reality is ultimately an infinite task that can never be fully grasped by reason—became a consistent thread throughout Soloveitchik's writings. It formed a key foundation for his later existentialist works, providing a philosophical basis for the concepts of human finitude, intellectual humility, and the inexhaustible mystery of the divine.

4.2 Situating the Dissertation in 20th-Century Jewish Thought

The dissertation is also a key document in what scholar Robert S. Schine terms the "Jewish/philosophical reception of Cohen in the years just before the Shoah." It offers a crucial snapshot of how a new generation of Jewish thinkers grappled with the legacy of Germany's most prominent Jewish philosopher on the eve of catastrophe.

In the aftermath of the Holocaust, Schine notes, a "bifurcation" occurred in Cohen scholarship. Some scholars read him primarily as a figure in the history of neo-Kantianism, paying little attention to his Jewish thought, while refugee scholars often focused on his Jewish writings with little regard for his place in German philosophy. Soloveitchik’s dissertation, by engaging Cohen as a serious philosopher within the broader history of German thought, provides a more holistic perspective that predates this tragic split. It treats Cohen not as a deluded apologist for German-Jewish culture, but as a "significant intellectual figure" whose powerful, if flawed, philosophical system demanded rigorous and sustained critique on its own terms.

The dissertation thus stands as a critical monument, both in the intellectual development of a great Jewish thinker and in the complex, often fraught, history of Jewish engagement with Western philosophy.

Conclusion

Joseph B. Soloveitchik's doctoral dissertation, Pure Thinking and the Constitution of Being in Hermann Cohen’s Work, stands as a powerful and penetrating critique of one of the dominant philosophical systems of its time. As this monograph has demonstrated, Soloveitchik systematically dismantled Cohen's "scientific idealism" by exposing its fundamental weaknesses: the untenable reduction of all logical thought to a single mathematical-scientific model; the internal contradictions in its core concepts of origin and unity; and its ultimate failure to account for the concrete, subjective, and sensory dimensions of human experience. He argued compellingly that Cohen's world of "pure thought" remained a world of abstractions, unable to bridge the gap to the individual, the empirical, and the real.

The dissertation's significance, however, is twofold. First, it is a formative text in the development of Soloveitchik's own thought, establishing the "epistemological pluralism" that would become a hallmark of his later, celebrated works. It was precisely this pluralistic stance, forged in a holistic engagement with Cohen the German philosopher, that allowed him to avoid the post-Shoah scholarly "bifurcation" that Robert Schine describes. Having rejected Cohen's monism, Soloveitchik was philosophically prepared to build his own complex, dialectical explorations of faith and reason. Second, the dissertation remains a significant contribution to the critical reception of neo-Kantianism within 20th-century Jewish philosophy. It represents a serious, sustained engagement with Hermann Cohen as a major figure in the Western philosophical tradition, offering a vital perspective from the vibrant and tragically lost world of pre-war German-Jewish intellectual life. In this respect, it is more than a critique; it is a monument to a world of thought and a testament to the enduring power of rigorous philosophical inquiry.