To know. — That is, they are written that one may know. The writer in this and the following verses heaps up synonyms with which to bring out the wide purpose of the instruction he offers.
Wisdom (chokhmah). — The original meaning of this word is “firmness,” “solidity,” having an opinion based upon sound reasons; the opposite state of mind to being “carried about with every wind of doctrine” (Ephesians 4:14).
Instruction (mûsâr). — Or rather, discipline, the knowledge how to keep oneself under control. (Comp. 2 Peter 1:6 : “Add to your knowledge temperance,” or self-control.)
To perceive the words of understanding. — Comp. Hebrews 5:14 : “To have the senses exercised to discern both good and evil.” (Comp. also Philippians 1:10.) The opposite condition to this is having the heart made “fat” (Isaiah 6:10) by continuance in evil, so that it can no longer understand.