Ecclesiastes 12:9-12

And further, because the Preacher was wise, he still taught the people knowledge; yea, he pondered, and sought out, and set in order many proverbs. The Preacher sought to find out acceptable words, and that which was written uprightly, even words of truth. The words of the wise are as goads; and as nails well fastened are the words of the masters of assemblies, which are given from one shepherd. And furthermore, my son, be admonished: of making many books there is no end; and much study is a weariness of the flesh.