Individual thoughts, or this and that thought, are modes which express the nature of God in a certain and determinate manner (Proposition 25, part I, Corollary). God therefore possesses an attribute (Definition 5, part I), the conception of which is involved in all individual thoughts, and through which they are conceived. Thought, therefore, is one of the infinite attributes of God which expresses the eternal and infinite essence of God.
(Ethics, 2P1)