Ecclesiastes 1:17 in the World English Bible
I applied my heart to know wisdom, and to know madness and folly. I perceived that this also was a chasing after wind.
Context
16 I communed with mine own heart, saying, Lo, I am come to great estate, and have gotten more wisdom than all they that have been before me in Jerusalem: yea, my heart had great experience of wisdom and knowledge.
17 And I gave my heart to know wisdom, and to know madness and folly: I perceived that this also is vexation of spirit.
18 For in much wisdom is much grief: and he that increaseth knowledge increaseth sorrow.