Cross reference
Ecclesiastes 3:9
9 What profit has he who works in that in which he labors?
Ecclesiastes 1:3
3 What does man gain from all his labor in which he labors under the sun?
Proverbs 14:23
23 In all hard work there is profit, But the talk of the lips leads only to poverty.
Ecclesiastes 2:11
11 Then I looked at all the works that my hands had worked, and at the labor that I had labored to do; and, behold, all was vanity and a chasing after wind, and there was no profit under the sun.
Ecclesiastes 5:16
16 This also is a grievous evil, that in all points as he came, so shall he go. And what profit does he have who labors for the wind?
Matthew 16:26
26 For what will it profit a man, if he gains the whole world, and forfeits his life? Or what will a man give in exchange for his life?
Ecclesiastes 2:22-23
22 For what has a man of all his labor, and of the striving of his heart, in which he labors under the sun?
23 For all his days are sorrows, and his travail is grief; yes, even in the night his heart takes no rest. This also is vanity.