Ecclesiastes 12:9-12

⁹Further, because Kohelet was wise, he still taught the people knowledge. Yes, he pondered, sought out, and set in order many proverbs.

¹⁰The Preacher sought to find out acceptable words, and that which was written blamelessly, words of truth.

¹¹The words of the wise are like goads; and like nails well fastened are words from the masters of assemblies, which are given from one shepherd.

¹²Furthermore, my son, be admonished: of making many books there is no end; and much study is a weariness of the flesh.