'Profit' in the Bible

What advantage does man have from all his workWhich he does under the sun (while earthbound)?

Then I considered all which my hands had done and labored to do, and behold, all was vanity and chasing after the wind and there was no profit (nothing of lasting value) under the sun.

What profit is there for the worker from that in which he labors?

After all, a king who cultivates the field is an advantage to the land.

For there are many other words that increase futility. What then is the advantage for a man?