Ecclesiastes 12:9-12

⁹And in addition to this that Koheleth was wise, he continually also taught the people knowledge, and he probed, and searched out, and composed many proverbs.

¹⁰Koheleth sought to find out acceptable words, and that which would be written down uprightly, even words of truth.

¹¹The words of the wise are like goads, and like nails fastened are the words of the men of the assemblies, which are given by one shepherd.

¹²But more than all these, my son, take warning for thyself: the making of many books would have no end; and much preaching is a weariness of the flesh.