Catena Fidei

Genesis 1:4 (WEB)
God saw the light, and saw that it was good. God divided the light from the darkness.

Catechism · 2

§299Paragraph 4 · The CreatorRead at vatican.va
“Because creation comes forth from God's goodness, it shares in that goodness - "and God saw that it was good. . . very good"” — Catechism footnote: Gen 1:4, 10, 12, 18, 21, 31.

§337Paragraph 5 · Heaven and EarthRead at vatican.va
God himself created the visible world in all its richness, diversity and order. Scripture presents the work of the Creator symbolically as a succession of six days of divine "work", concluded by the "rest" of the seventh day.

Augustine of Hippo, Confessions XIII.20Book XIII
“For “there is no speech, nor language, where their voice is not heard;” seeing their sound “hath gone through all the earth, and their words to the end of the world,” because Thou, O Lord, hast multiplied these things by blessing.” — editor's note: Gen. i. 4.
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Augustine of Hippo, Expositions on the Psalms Psalm 7
“This is the distinction, He made the one and ordered it: but the other He made not, but yet He ordered this too.” — editor's note: Gen. i. 4, 5.
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Augustine of Hippo, Expositions on the Psalms Psalm 94
“On the fourth day, the Lord made the lights in heaven: “The sun to rule the day: the moon and stars to govern the night:” this was the work of the fourth day.” — editor's note: Gen. i. 3–19.
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Augustine of Hippo, On the Holy Trinity IV.6Book IV
“For as the first days of all were reckoned from light to night, on account of the future fall of man; so these on account of the restoration of man, are reckoned from darkness to light.” — editor's note: Gen. i. 4, 5
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Augustine of Hippo, Tractates on the Gospel of John Tractate 44
““God divided between the light and the darkness: the light He called Day, and the darkness He called Night.”” — editor's note: Gen. i. 4, 5.
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Ambrose of Milan, Exposition of the Christian Faith IV.6Book IV
“And God saw the light that it was good.”” — editor's note: Gen. i. 3, 4.
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Basil the Great, Hexaemeron Homily 2
“And God saw the light, that it was good.” — editor's note: Gen. i. 4.
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Leo the Great, Sermons Sermon 27
“For as it is now day time and now night time, so the Creator has constituted divers kinds of luminaries, although even before they were made there had been days without the sun and nights without the moon.” — editor's note: He is of course following the Mosaic order of creation, where the creation of the day and night is ascribed to the first day and that of the Sun and Moon to…
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Hippolytus of Rome, The Refutation of All Heresies VIII.2Book VIII
“After, then, he had formed the firmament over the nether world, “he both divided the darkness from the light, and called the light which was above the firmament day, and the darkness he called night.”” — editor's note: Gen. i. 4, 5, 7.
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