Ecclesiastes 1:12-14

Young's Literal Translation

¹² I, a preacher, have been king over Israel in Jerusalem.

¹³ And I have given my heart to seek and to search out by wisdom concerning all that hath been done under the heavens. It [is] a sad travail God hath given to the sons of man to be humbled by it.

¹⁴ I have seen all the works that have been done under the sun, and lo, the whole [is] vanity and vexation of spirit!