Ecclesiastes 2:3
I sought in mine heart to give myself unto wine, yet acquainting mine heart with wisdom; and to lay hold on folly, till I might see what was that good for the sons of men, which they should do under the heaven all the days of their life.
Ecclesiastes 3:18
I said in mine heart concerning the estate of the sons of men, that God might manifest them, and that they might see that they themselves are beasts.
Ecclesiastes 9:10
Whatsoever thy hand findeth to do, do it with thy might; for there is no work, nor device, nor knowledge, nor wisdom, in the grave, whither thou goest.