reason

in the first Critique, the highest faculty of the human subject, to which all other faculties are subordinated. It abstracts completely from the conditions of sensibility. The second Critique examines the form of our desires in order to construct a system based on the faculty of reason (= the practical standpoint). Reason's primary function is practical; its theoretical function, though often believed to be more important, should be viewed as having a secondary importance. (Cf. judgment.)