After a brief account of the main arguments of Fichte's Science of Knowledge, I turn to Hegel as the figure who occupies the pinnacle of German Idealism and the theoretical conclusion of its development from Kant onwards. In preparation for some later discussion, when I turn to Barth, I focus especially on the third part of Hegel's Science of Logic and his discussion of the so-called ontological proof of the existence of God in the section on the Syllogism.