'Toil' in the Bible

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

All things are wearisome and all words are frail;Man cannot express it.The eye is not satisfied with seeing,Nor is the ear filled with hearing.

Whatever my eyes looked at with desire I did not refuse them. I did not withhold from my heart any pleasure, for my heart was pleased because of all my labor; and this was my reward for all my labor.

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

Also, every man to whom God has given riches and possessions, He has also given the power and ability to enjoy them and to receive [this as] his [allotted] portion and to rejoice in his labor—this is the gift of God [to him].

Then I commended pleasure and enjoyment, because a man [without God] has no better thing under the sun than to eat and to drink and to be merry, for this will stand by him in his toil through the days of his life which God has given him under the sun.

and I saw all the work of God, I concluded that man cannot discover the work that is done under the sun. Even though man may labor in seeking, he will not discover; and [more than that], though a wise man thinks and claims he knows, he will not be able to find it out.

Live joyfully with the wife whom you love all the days of your fleeting life which He has given you under the sun—all the days of vanity and futility. For this is your reward in life and in your work in which you have labored under the sun.