Read it through once

I distinguish between two kinds or operations of Imagination; the primary, by which we perceive or conceive the unity of the manifold in sense, and the secondary, by which the mind shapes and modifies its perceptions according to forms not originally present. The primary Imagination is the living power and prime agent of all human perception, and as a repetition in the finite mind of the eternal act of creation it is coextensive with the faculties of perception themselves.