Ecclesiastes 1, 2 & 3

What profit has man from all the labor which he toils at under the sun? One generation passes and another comes, but the world forever stays.

The sun rises and the sun goes down; then it presses on to the place where it rises. Blowing now toward the south, then toward the north, the wind turns again and again, resuming its rounds. All rivers go to the sea, yet never does the sea become full. To the place where they go, the rivers keep on going.

All speech is labored; there is nothing man can say. The eye is not satisfied with seeing nor is the ear filled with hearing. What has been, that will be; what has been done, that will be done. Nothing is new under the sun.

Even the thing of which we say, "See, this is new!" has already existed in the ages that preceded us. There is no remembrance of the men of old; nor of those to come will there be any remembrance among those who come after them.

Ecclesiastes 1:3-11

For to whatever man he sees fit he gives wisdom and knowledge and joy; but to the sinner he gives the task of gathering possessions to be given to whatever man God sees fit.

Ecclesiastes 2:26

For every man, moreover, to eat and drink and enjoy the fruit of all his labor is a gift of God. I recognized that whatever God does will endure forever; there is no adding to it, or taking from it. Thus has God done that he may be revered.

What now is has already been; what is to be, already is; and God restores what would otherwise be displaced.

Both go to the same place; both were made from the dust, and to the dust they both return. Who knows if the life-breath of the children of men goes upward and the life-breath of beasts goes earthward?

And I saw that there is nothing better for a man than to rejoice in his work; for this is his lot. Who will let him see what is to come after him?

Ecclesiastes 3:13-15, 20-22