Eternity has no time. It is itself all time. It acts; it cannot then suffer. It cannot be born, therefore it lacks age. God, if old, forfeits the eternity that is to come; if new, the eternity which is past.2419 The newness bears witness to a beginning; the oldness threatens an end. God, moreover, is as independent of beginning and end as He is of time, which is only the arbiter and measurer of a beginning and an end.
The Five Books Against Marcion