New Defender's Study Bible Notes
9:9 the wife whom thou lovest. Note Proverbs 5:15-19 and Song of Solomon (Introduction) and contrast Ecclesiastes 7:28. In retrospect, King Solomon was well able from his sad experience with multiple wives to urge the far better way of monogamy.
9:10 with thy might. Note Colossians 3:23. God does not expect more than we can do, but He does require that we do whatever we can do “heartily, as unto the Lord” and that we do it “with our might.”