Ernst Cassirer

Early Life and Philosophical Formation

Ernst Cassirer was born on July 28, 1874, in Breslau (now Wrocław, Poland), into a prosperous Jewish family. He received an elite education, studying law and then literature and philosophy at various German universities before settling at Berlin, where he attended Georg Simmel's lectures. The most decisive intellectual encounter of his early life came when he read Herman Cohen's Kants Theorie der Erfahrung (Kant's Theory of Experience) and traveled to Marburg to study under Cohen — the leader of the Marburg school of Neo-Kantianism.

Cassirer received his doctorate from Marburg in 1899 with a dissertation on Descartes's analysis of mathematical and natural scientific knowledge. He remained deeply influenced by Cohen's and Paul Natorp's program of 'pure logic' as the foundation of knowledge, but from the beginning Cassirer was drawn toward a broader cultural application of the critical method that would eventually take him far beyond the Marburg program.

Early Work: Leibniz and the Problem of Knowledge

Cassirer's first major publication, Leibniz's System in Its Scientific Foundations (1902), was followed by his monumental four-volume The Problem of Knowledge in the Philosophy and Science of the Modern Age (1906–1950) — a comprehensive intellectual history of epistemology from the Renaissance to the twentieth century. This massive historical work already revealed Cassirer's characteristic method: the analysis of philosophical problems through their historical development, combined with the systematic philosophical reconstruction of their underlying logic.

His Substance and Function (1910) — one of the most important works of Neo-Kantian philosophy — argued that modern science does not discover substances and their properties but constructs functional relations and mathematical laws. Concepts are not abstractions from particulars (as in Aristotelian logic) but rules for generating series — the concept of number is not abstracted from groups of objects but is the rule that generates the number series.

The Hamburg Years and the Warburg Library

In 1919, Cassirer was appointed to the newly founded University of Hamburg — the first German university to appoint a Jewish professor to a full chair without the nominee converting to Christianity. Hamburg brought a transformative intellectual encounter: the Warburg Library (Kulturwissenschaftliche Bibliothek Warburg), the extraordinary private scholarly library assembled by Aby Warburg around the theme of the classical tradition in Western culture.

The Warburg Library — organized not by discipline but by problem, following Warburg's conviction that classical myth and symbol survive in unexpected ways throughout Western culture — provided Cassirer with both an intellectual community and a stimulus that transformed his project. The encounter with Warburg's questions about myth, symbol, and the history of cultural forms led directly to the Philosophy of Symbolic Forms.

The Philosophy of Symbolic Forms

Cassirer's Philosophy of Symbolic Forms (3 vols., 1923, 1925, 1929) is his masterpiece. The three volumes are devoted respectively to language, myth, and science (the 'phenomenology of knowledge'), with a posthumous fourth volume on the metaphysics of symbolic forms.

The central thesis is that the human being is the 'animal symbolicum' — the animal that does not respond directly to reality but constructs and inhabits a symbolic universe. Language, myth, art, religion, science, and history are all 'symbolic forms': autonomous systems through which the human spirit constructs and articulates experience. Each has its own internal logic, its own way of organizing space, time, number, and causality; none can be reduced to another.

This was a direct challenge to the positivist hierarchy of knowledge, which regarded myth and religion as primitive precursors to science that science supersedes. Cassirer argued that myth expresses a genuine and irreplaceable mode of experience — the mode of immediate participation, in which boundaries between self and world, human and divine, dissolve — that science does not replace but simply differs from.

The second volume, on mythical thinking, is philosophically the most original. Cassirer argues that myth is not primitive science (failed attempts to explain natural phenomena) but a symbolic form in its own right, organized by the category of the 'sacred' rather than the category of cause-and-effect. Mythical space is not neutral geometric space but qualitative sacred space; mythical time is not homogeneous temporal sequence but the time of ritual, festival, and origin.

The Davos Debate with Heidegger

In 1929, at the famous Davos University Conference, Cassirer engaged in a celebrated three-day public debate with Martin Heidegger — the most dramatic philosophical confrontation of the twentieth century. The debate concerned the interpretation of Kant: Cassirer defended the primacy of theoretical reason and the progressive emancipation of the human spirit through cultural form; Heidegger emphasized finitude, anxiety, and the radical limitations of human existence.

The two positions were not merely different interpretations of Kant but different visions of the human condition. Those who witnessed the debate — including the young Levinas — felt they were watching two epochs of philosophy in direct confrontation. Cassirer's more humanistic and optimistic vision was associated with the Weimar Republic's liberal promise; Heidegger's emphasis on finitude and authentic resolve would soon be associated — by Heidegger himself — with the Nazi movement.

Exile and the Philosophy of Human Culture

Hitler's accession to power in 1933 made Cassirer's position in Germany untenable. He resigned his Hamburg chair, where he had just served as rector (the first Jewish rector of a German university), and began a decade of exile: Oxford (1933–1935), Gothenburg (1935–1941), Yale (1941–1944), Columbia (1944–1945).

The exile years were enormously productive. Cassirer wrote The Philosophy of the Enlightenment (1932 — published just before exile), Determinism and Indeterminism in Modern Physics (1936), Descartes (1939), The Myth of the State (1946 — completed in the last months of his life and published posthumously), and An Essay on Man (1944) — his synthetic account of the philosophy of human culture written in English for American audiences.

The Myth of the State was Cassirer's direct confrontation with political mythology — the systematic creation and manipulation of myth for political purposes that he saw exemplified in National Socialism. Myth, he argued, is not simply a pre-scientific worldview that modernity has overcome; it can be 'manufactured' — deliberately constructed and deployed as a political instrument — and when political mythology takes hold, rational argument is disarmed.

Cassirer died on April 13, 1945, in New York, just weeks before Germany's surrender — and just weeks before his greatest enemy's death in Berlin.

Legacy

Cassirer's influence has been vast but dispersed. His philosophy of symbolic forms influenced Ernst Mayr in biology, Suzanne Langer in aesthetics, and the entire cultural studies tradition. His intellectual history remains essential for scholars of modern philosophy. His analysis of political mythology has been rediscovered by scholars of fascism and propaganda. The rediscovery of his work since the 1990s has revealed him as one of the most important and most underestimated philosophers of the twentieth century.