Day unto day utters speech, and night unto night shows knowledge.
All Commentaries on Psalms 19:2 Go To Psalms 19
Augustine of Hippo
3. "Day unto day uttereth word" (ver. 2). To the spiritual the Spirit giveth out the fulness of the unchangeable Wisdom of God, the Word which in the beginning is God with God. "And night unto night announceth knowledge." And to the fleshly, as to those afar off, the mortality of the flesh, by conveying faith, announceth future knowledge.