Proverbs 22:20 - Albert Barnes' Notes on the Bible

Excellent things - A meaning of the word derived from “the third,” i. e., “the chief of three warriors in a chariot” (compareExodus 14:7 Exodus 14:7 note). Another reading of the Hebrew text gives “Have I not written to thee long ago?” and this would form a natural antithesis to “this day” of Proverbs 22:19. The rendering of the Septuagint is: “write them for thyself three times;” that of the Vulgate, “I have written it (i. e., my counsel) In threefold form;” the “three times” or “threefold form” being referred either to the Proverbs, Ecclesiastes, the Song of Solomon, or to the division of the Old Testament into the Law, the prophets, and the Hagiographa.