God’s resting is not, then, as some conceive, that God ceased from doing. For, being good, if He should ever cease from doing good, then would He cease from being God, which it is sacrilege even to say. The resting is, therefore, the ordering that the order of created things should be preserved inviolate, and that each of the creatures should cease from the ancient disorder. For the creations on the different days followed in a most important succession; so that all things brought into existence might have honour from priority, created together in thought, but not being of equal worth. Nor was the creation of each signified by the voice, inasmuch as the creative work is said to have made them at once. For something must needs have been named first. Wherefore those things were announced first, from which came those that were second, all things being originated together from one essence by one power. For the will of God was one, in one identity. And how could creation take place in time, seeing time was born along with things which exist.
“This is the book of the generation: also of the things in them, when they were created in the day that God made heaven and earth.” For the expression “when they were created” intimates an indefinite and dateless production. But the expression “in the day that God made,” that is, in and by which God made “all things,” and “without which not even one thing was made,” points out the activity exerted by the Son. As David says, “This is the day which the Lord hath made; let us be glad and rejoice in it;” that is, in consequence of the knowledge imparted by Him, let us celebrate the divine festival; for the Word that throws light on things hidden, and by whom each created thing came into life and being, is called day.
— The Stromata, Bk. VI. Ch. XVI