Ecclesiastes 6:10-12

That which hath been is named already, and it is known that it is man: neither may he contend with him that is mightier than he. Seeing there be many things that increase vanity, what is man the better? For who knoweth what is good for man in this life, all the days of his vain life which he spendeth as a shadow? for who can tell a man what shall be after him under the sun?