Abstract

The book (I) deals systematically with a conception of reason that creates and deploys ‘ideas’ as pure representations of something that is not or only partially given in experience. This conception—developed in Kant’s Transcendental Dialectic, unfolded throughout his works and set as the highest point in Fichte’s Wissenschaftslehre—is the most important key to understanding transcendental philosophy and classical German philosophy. Moreover, the book (II) argues that the set of theories regarding reason ‘in the narrower sense’ (the faculty of ideas) constitutes a research program that can be developed further and compete / cooperate with alternate projects (theories of rationality and reasonability) in contemporary contexts; it can also be successfully defended against Pyrrhonical objections and the post-idealistic critique of reason.