Nicene and Post-Nicene Fathers, Vol. II:
City of God: Chapter 7

Chapter 7.—Of the Nature of the First Days, Which are Said to Have Had Morning and Evening, Before There Was a Sun.

We see, indeed, that our ordinary days have no evening but by the setting, and no morning but by the rising, of the sun; but the first three days of all were passed without sun, since it is reported to have been made on the fourth day.  And first of all, indeed, light was made by the word of God, and God, we read, separated it from the darkness, and called the light Day, and the darkness Night; but what kind of light that was, and by what periodic movement it made evening and morning, is beyond the reach of our senses; neither can we understand how it was, and yet must unhesitatingly believe it.  For either it was some material light, whether proceeding from the upper parts of the world, far removed from our sight, or from the spot where the sun was afterwards kindled; or under the name of light the holy city was signified, composed of holy angels and blessed spirits, the city of which the apostle says, “Jerusalem which is above is our eternal p. 209 mother in heaven;” 459 and in another place, “For ye are all the children of the light, and the children of the day; we are not of the night, nor of darkness.” 460   Yet in some respects we may appropriately speak of a morning and evening of this day also.  For the knowledge of the creature is, in comparison of the knowledge of the Creator, but a twilight; and so it dawns and breaks into morning when the creature is drawn to the praise and love of the Creator; and night never falls when the Creator is not forsaken through love of the creature.  In fine, Scripture, when it would recount those days in order, never mentions the word night.  It never says, “Night was,” but “The evening and the morning were the first day.”  So of the second and the rest.  And, indeed, the knowledge of created things contemplated by themselves is, so to speak, more colorless than when they are seen in the wisdom of God, as in the art by which they were made.  Therefore evening is a more suitable figure than night; and yet, as I said, morning returns when the creature returns to the praise and love of the Creator.  When it does so in the knowledge of itself, that is the first day; when in the knowledge of the firmament, which is the name given to the sky between the waters above and those beneath, that is the second day; when in the knowledge of the earth, and the sea, and all things that grow out of the earth, that is the third day; when in the knowledge of the greater and less luminaries, and all the stars, that is the fourth day; when in the knowledge of all animals that swim in the waters and that fly in the air, that is the fifth day; when in the knowledge of all animals that live on the earth, and of man himself, that is the sixth day. 461

Footnotes

Gal. 4.26.

1 Thess. 5.5.

Comp. de Gen. ad Lit. i. and iv.