 Cohen himself came to think that one commitment above all else unified his philosophy, from his earliest interpretation of Kant to his mature System of Philosophy. It was his commitment to a philosophical method he claimed was Kant’s, and that Cohen and his students called the “transcendental method.” What follows is a sketch of that method in Cohen’s philosophy: how it emerged from his interpretation of Kant; how he sought to apply that method in epistemology and philosophy of science, as well as in ethics, political theory, and aesthetics; and finally, how he sought to articulate a view of religion as a necessary counterpart to philosophy done according to that method.