Having considered the existence of God, we now proceed to the questions (QQ.3-13) that treat of his essence.
We cannot know what God is, but only what He is not. So to study Him, we study what He has not -- such as composition and motion. His simplicity (3) or lack of composition. His perfection: and because everything in so far as it is perfect is called good, we shall speak of His goodness (6) -- and goodness in general (5) -- as well as His perfection (4). His infinity (7) and omnipresence (8). His immutability (9), and His eternity (10) following on His immutability. His unity (11). How God is known by us (12). The names of God (13).