Ecclesiastes 8:16-17

¹⁶Whereupon I set my heart to know wisdom, and to perceive the trouble that was wrought upon the earth: for there is that neither by day nor night sees sleep with his eyes.

¹⁷And I *saw all the works of God, that a man shall not be able to discover the work which is wrought under the sun; whatever things a man shall endeavor to seek, however a man may labor to seek it, yet he shall not find it; yes, how much soever a wise man may speak of knowing it, he shall not be able to find it: for I applied all this to my heart, and my heart has seen all this.