'Profit' in the Bible

What profit hath man of all his labor wherein he laboreth under the sun?

Then I looked on all the works that my hands had wrought, and on the labor that I had labored to do; and, behold, all was vanity and a striving after wind, and there was no profit under the sun.

What profit hath he that worketh in that wherein he laboreth?

Moreover the profit of the earth is for all: the king himself is served by the field.

And this also is a grievous evil, that in all points as he came, so shall he go: and what profit hath he that he laboreth for the wind?