Cross reference
Ecclesiastes 3:9
9 What profit has the worker in the work which he does?
Ecclesiastes 1:3
3 What is a man profited by all his work which he does under the sun?
Proverbs 14:23
23 In all hard work there is profit, but talk only makes a man poor.
Ecclesiastes 2:11
11 Then I saw all the works which my hands had made, and everything I had been working to do; and I saw that all was to no purpose and desire for wind, and there was no profit under the sun.
Ecclesiastes 5:16
16 All his days are in the dark, and he has much sorrow, pain, disease, and trouble.
Matthew 16:26
26 For what profit has a man, if he gets all the world with the loss of his life? or what will a man give in exchange for his life?
Ecclesiastes 2:22-23
22 What does a man get for all his work, and for the weight of care with which he has done his work under the sun?
23 All his days are sorrow, and his work is full of grief. Even in the night his heart has no rest. This again is to no purpose.