Ecclesiastes 6:12
For who knoweth what good for man in 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?
ā The Restored Word Bible
Context
10 That which has been is named already, and it is known that it man: neither may he contend with him that is mightier than he.
11 Seeing there be many things that increase vanity, what man the better?
12 For who knoweth what good for man in 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?