This paper will consider Augustine's interpretation of divine rest disclosed in the seventh day (Gn Litt. IV.14.25-16.27) and in particular the affirmation of an eternal rest in God. The focus will be on Augustine's claim that God rests ab opera as opposed to in opera. It will consider Augustine's claim in Gn. Litt. about the relation of being and act for both God and humans. In medieval theology, this becomes a locus classicus for both the interpretation of divine rest in Genesis 2:1-2 as well as for dogmatically treating divine aseity. The paper will consider potential problems with identifying aseity with divine rest ab opera. Finally, it briefly considers the implications for modern treatments of divine freedom.