2 Tim.2:15 (KJV) " Study to show thyself approved unto God, a workman that needeth not to be ashamed, rightly dividing the word of truth."
Col.3:16 " Let the word of Christ richly dwell within you; with all wisdom teaching and admonishing one another with psalms and hymns and spiritual songs, singing with thankfulness in your hearts to God."
If you're rich in something, how much of it do you have?
Eccl.12:11-12 " The words of wise men are like goads, and masters of these collections are like well-driven nails; they are given by one Shepherd. But beyond this, my son, be warned: the writing of many books is endless, and excessive devotion to books is wearying to the body."