Ecclesiastes 8:16-17

¹⁶And I applied my heart to know wisdom, and to understand the distraction that is upon earth: for there are some that day and night take no sleep with their eyes.

¹⁷And I understood that man can find no reason of all those works of God that are done under the sun: and the more he shall labour to seek, so much the less shall he find: yea, though the wise man shall say, that he knoweth it, he shall not be able to find it.