Charles H. Spurgeon on Psalms 19:2

"Day unto day," etc. But what is the meaning of the next word —One day telleth another, and one night certifieth another? Literally, dies diem dicit, is nothing else but dies diem docet. One day telleth another, is one day teacheth another. The day past is instructed by the day present: every new day doth afford new doctrine. The day is a most apt time to learn by reading and conference; the night a most fit time for invention and meditation. Now that which thou canst not understand this day thou mayest haply learn the next, and that which is not found out in one night may be gotten in another. Mystically (saith Hierem), Christ is this "day," who saith of himself, "I am the light of the world," and his twelve apostles are the twelve hours of the day; for Christ's Spirit revealed by the mouths of his apostles the mysteries of our salvation, in other ages not so fully known unto the sons of men. One day telleth another, that is, the spiritual utter this unto the spiritual; and one night certifieth another, that is, Judas insinuates as much unto the Jews in the night of ignorance, saying, "Whomsoever I shall kiss, that is he, lay hold on him." Matthew 26:28. Or, the Old Testament only shadowing Christ is the night, and the New Testament plainly showing Christ is the day. —John Boys.