Ecclesiastes 1:11-13

11 There is no memory of those who have gone before, and of those who come after there will be no memory for those who are still to come after them.

12 I, the Preacher, was king over Israel in Jerusalem.

13 And I gave my heart to searching out in wisdom all things which are done under heaven: it is a hard thing which God has put on the sons of men to do.