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

I have seen the travail, which God hath given to the sons of
men to be exercised in it.

He hath made every thing beautiful in his time: also he hath
set the world in their heart, so that no man can find out the
work that God maketh from the beginning to the end.

I know that there is no good in them, but for a man to
rejoice, and to do good in his life.

And also that every man should eat and drink, and enjoy the
good of all his labour, it is the gift of God.

I know that, whatsoever God doeth, it shall be for ever:
nothing can be put to it, nor any thing taken from it: and God
doeth it, that men should fear before him.

That which hath been is now; and that which is to be hath
already been; and God requireth that which is past.

And moreover I saw under the sun the place of judgment, that
wickedness was there; and the place of righteousness, that
iniquity was there.

I said in mine heart, God shall judge the righteous and the
wicked: for there is a time there for every purpose and for
every work.

I said in mine heart concerning the estate of the sons of men,
that God might manifest them, and that they might see that
they themselves are beasts.

For that which befalleth the sons of men befalleth beasts;
even one thing befalleth them: as the one dieth, so dieth the
other; yea, they have all one breath; so that a man hath no
preeminence above a beast: for all is vanity.

All go unto one place; all are of the dust, and all turn to
dust again.

Who knoweth the spirit of man that goeth upward, and the
spirit of the beast that goeth downward to the earth?

Wherefore I perceive that there is nothing better, than that a
man should rejoice in his own works; for that is his portion:
for who shall bring him to see what shall be after him?

Ecclesiastes 3.9-22

Source:

http://www.gutenberg.org/dirs/etext05/bib2110h.htm

The Project Gutenberg EBook The Bible, King James, Book 21: Ecclesiastes