Ecclesiastes 1:3
What does a man gain from all his labor, at which he toils under the sun?

Ecclesiastes 2:11, 22, 23
Yet when I considered all the works that my hands had accomplished and what I had toiled to achieve, I found everything to be futile, a pursuit of the wind; there was nothing to be gained under the sun. . . .

Ecclesiastes 5:16
This too is a grievous evil: Exactly as a man is born, so he will depart. What does he gain as he toils for the wind?

Proverbs 14:23
There is profit in all labor, but mere talk leads only to poverty.

Matthew 16:26
What will it profit a man if he gains the whole world, yet forfeits his soul? Or what can a man give in exchange for his soul?