"Who can tell"

1. 2 Sam. 12: 22
     22 And he said, While the child was yet alive, I fasted and wept: for I said, Who can tell whether God will be gracious to me, that the child may live?
2. Eccl. 6: 12
     12 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?
3. Eccl. 8: 7
     7 For he knoweth not that which shall be: for who can tell him when it shall be?
4. Eccl. 10: 14
     14 A fool also is full of words: a man cannot tell what shall be; and what shall be after him, who can tell him?
5. Jonah 3: 9
     9 Who can tell if God will turn and repent, and turn away from his fierce anger, that we perish not?