God is mere and sheer existence, not existence modelled upon some quiddity (Chap. XXII). In this study it should be borne in mind that 'essence' represents the ideal order: 'existence' the actual. God is the unity of essence and existence, of the ideal and the actual; the point at which the potential finally vanishes into the actual. In every existent being, under God, there is an admixture of potentiality. This is to be kept steadily in view in bringing St Thomas to bear upon Kant and Hegel.
Of God and His Creatures: 1.25