We feel and perceive no particular things, save bodies and modes of thought.
N.B.

The Postulates are given after the conclusion of Prop.
xiii.
PROPOSITIONS PROP.I.Thought is an attribute of God, or God is a thinking thing.
Proof .-- Particular thoughts, or this and that thought, are modes which, in a certain conditioned manner, express the nature of God (Pt.i., Prop.xxv., Coroll.).

God therefore possesses the attribute (Pt.i., Def.

v.) of which the concept is involved in all particular thoughts, which latter are conceived thereby.
Thought, therefore, is one of the infinite attributes of God, which express God's eternal and infinite essence (Pt.i., Def.
vi.).

In other words, God is a thinking thing.