Ecclesiastes 1:15KJV

13And I gave my heart to seek and search out by wisdom concerning all that are done under heaven: this sore travail hath God given to the sons of man to be exercised therewith.

14I have seen all the works that are done under the sun; and, behold, all vanity and vexation of spirit.

15crooked cannot be made straight: and that which is wanting cannot be numbered.

16I communed with mine own heart, saying, Lo, I am come to great estate, and have gotten more wisdom than all that have been before me in Jerusalem: yea, my heart had great experience of wisdom and knowledge.

17And I gave my heart to know wisdom, and to know madness and folly: I perceived that this also is vexation of spirit.