Immanuel Kant was unable to develop an adequate theory of subjectivity as intrinsic self-relation, a theory that would elucidate such self-relation not simply in general but in the specific theoretical and practical sense of one's own consciousness and one's own will, and would pay due attention to the relevant common features and specific differences involved here. It is clear that one should take the last mentioned characterisation of practical self-relation in particular very seriously since the Critique of Pure Reason describes the a priori synthesis that underlies all a posteriori synthesis in Kant's view as a free synthesis. Formulated very briefly for the purpose of clarification, the fundamental thesis of Kant's theoretical philosophy amounts to this: knowledge or experience, in short, theory can be explained only by reference to spontaneity. Kant's task is to develop a spontaneous, and entirely novel, conception of theory on the basis of spontaneity itself.