Ecclesiastes 2:21

I hated all my labor in which I labored under the sun, because I must leave it to the man who comes after me.

Who knows whether he will be a wise man or a fool? Yet he will have rule over all of my labor in which I have labored, and in which I have shown myself wise under the sun. This also is vanity.

Therefore I began to cause my heart to despair concerning all the labor in which I had labored under the sun.

For what does a man have of all his labor and of the striving of his heart, in which he labors under the sun?

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.

There is nothing better for a man than that he should eat and drink, and make his soul enjoy good in his labor. This also I saw, that it is from the hand of God.