If God is eternal, then he has no beginning and no end, and His action extends to every moment, rather than being limited in time as our action is. St. Thomas unpacks the implications of these ideas. We already know from the previous Article that eternity has to do with changelessness, and we already know from Question 9 that God is changeless – so He must be eternal too, and there is nothing left to do in this Article – right? Not quite. Besides, most of the heavy lifting in this Article is in the Replies to the Objections.