Soul is active, not passive—central to constructing experience. Kant: we can never know "soul" as a thing-in-itself. Fichte: ego (Ich) posits itself—soul as dynamic self-consciousness. Schelling: soul and nature are aspects of the Absolute unfolding. Hegel: soul partakes in Spirit (Geist), unfolding historically and dialectically. Emphasis on development of the soul through culture and reason.