13 And I gave my heart to seek and search out by wisdom concerning all [things] that are done under heaven: this grievous labor hath God given to the sons of man to be exercised with it.
14 I have seen all the works that are done under the sun; and behold, all [is] vanity and vexation of spirit.
15 [That which is] crooked cannot be made straight: and that which is wanting cannot be numbered.
16 I communed with my own heart, saying, Lo, I have come to great estate, and have gained more wisdom than all [they] that have been before me in Jerusalem: and 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.