3:9 What benefit can a worker gain from his toil?
2:22 What does a man acquire from all his labor
and from the anxiety that accompanies his toil on earth?
4:6 Better is one handful with some rest
than two hands full of toil and chasing the wind.
10:15 The toil of a stupid fool wears him out,
because he does not even know the way to the city.