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Psalm 19:2 (WEB)
Day after day they pour out speech, and night after night they display knowledge.

Catechism · 2

§299Paragraph 4 · The CreatorRead at vatican.va
“Our human understanding, which shares in the light of the divine intellect, can understand what God tells us by means of his creation, though not without great effort and only in a spirit of humility and respect before the Creator and his work.” — Catechism footnote: Cf. Ps 19:2-5; Job 42:3.

§326Paragraph 5 · Heaven and EarthRead at vatican.va
“Finally, "heaven" refers to the saints and the "place" of the spiritual creatures, the angels, who surround God.” — Catechism footnote: Pss 115:16; 19:2; Mt 5:16.

Gregory of Nyssa, Answer to Eunomius' Second Book Chapter 1
“Day unto day uttereth speech, and night unto night showeth knowledge;” and after saying that the heavens and the firmament declare, and that day and that night showeth knowledge and speech, he adds to what he has said, that “there is neither speech nor language, and that their voices are not heard.”” — editor's note: Ps. xix. 1–3 (LXX.).
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Cyril of Jerusalem, Catechetical Lectures Lecture 10
“And the nights again complete the like courses; so that the Psalmist also says of them, Day unto day uttereth speech, and night unto night proclaimeth knowledge.” — editor's note: Ps. xix. 2. Compare a beautiful passage of Theophilus of Antioch (To Autolycus, vi.).
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Justin Martyr, Dialogue with Trypho Chapter 64
“In the sun has he set his habitation; and he, like a bridegroom going forth from his chamber, will rejoice as a giant to run his race: from the highest heaven is his going forth, and he returns to the highest heaven, and there is not one who shall be hidden from his heat.’ ”” — editor's note: Ps. xix. 1–6.
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Augustine of Hippo, Expositions on the Psalms Psalm 19
““Day unto day uttereth word” (ver. 2).” — the author cites it
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Augustine of Hippo, Harmony of the Gospels I.30Book I
“Now has His going forth been made from the height of heaven, and His return even to the height of heaven.” — editor's note: [Ps. xix. 1–6, partly in citation, partly in allegorizing paraphrase.—R.]
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Augustine of Hippo, Tractates on the Gospel of John Tractate 62
“The day therefore uttered speech unto the day, that is, Christ did so to His faithful disciples, that they might hear and love Him as His followers; and the night showed knowledge unto the night, that is, Judas did so to the unbelieving Jews, that they might come as His persecutors, and make Him their prisoner.” — editor's note: Ps. xix. 2.
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Ambrose of Milan, Letters Letter 22
““Day,” it is said, “unto day uttereth speech.”” — editor's note: Ps. xix. [xviii.] 2.
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Leo the Great, Sermons Sermon 19
“For, when the prophet says, “The heavens declare the glory of God, and the firmament showeth His handiwork: day unto day uttereth speech, and night showeth knowledge,” what is there by which the Truth does not speak to us?” — editor's note: Ps. xix. 1, 2.
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Clement of Alexandria, The Stromata, or Miscellanies V.10Book V
““Day utters speech to day” (what is clearly written), “and night to night proclaims knowledge” (which is hidden in a mystic veil); “and there are no words or utterances whose voices shall not be heard” by God, who said, “Shall one do what is secret, and I shall not see him?”” — editor's note: Ps. xix. 2, 3.
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Clement of Alexandria, The Stromata, or Miscellanies VII.1Book VII
“Thus, not to look at what is urgent would be excessively indolent and defective; and “blessed, in truth, are they who, investigating the testimonies of the Lord, shall seek Him with their whole heart.”” — editor's note: Ps. cxix. 2.
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