I applied my mind to seek and explore through wisdom all that is done under heaven. God has given people this miserable task to keep them occupied.

The one who digs a pit may fall into it,
and the one who breaks through a wall may be bitten by a snake.

on the day when the guardians of the house tremble,
and the strong men stoop,
the women who grind cease because they are few,
and the ones who watch through the windows see dimly,