Ecclesiastes 1:18 WEB

¹⁶  I said to myself, 'Behold, I have obtained for myself great wisdom above all who were before me in Jerusalem. Yes, my heart has had great experience of wisdom and knowledge.'

¹⁷  I applied my heart to know wisdom, and to know madness and folly. I perceived that this also was a chasing after wind.

¹⁸  For in much wisdom is much grief; and he who increases knowledge increases sorrow.