Ecclesiastes 2:11, 15, 17, 19, 21, 23, 26

Then I looked on all the works that my hands had wrought, and on the labor that I had labored to do; and, behold, all was vanity and a striving after wind, and there was no profit under the sun.

Then said I in my heart, As it happeneth to the fool, so will it happen even to me; and why was I then more wise? Then said I in my heart, that this also is vanity.

So I hated life, because the work that is wrought under the sun was grievous unto me; for all is vanity and a striving after wind.

And who knoweth whether he will be a wise man or a fool? yet will he have rule over all my labor wherein I have labored, and wherein I have showed myself wise under the sun. This also is vanity.

For there is a man whose labor is with wisdom, and with knowledge, and with skilfulness; yet to a man that hath not labored therein shall he leave it for his portion. This also is vanity and a great evil.

For all his days are but sorrows, and his travail is grief; yea, even in the night his heart taketh no rest. This also is vanity.

For to the man that pleaseth him God giveth wisdom, and knowledge, and joy; but to the sinner he giveth travail, to gather and to heap up, that he may give to him that pleaseth God. This also is vanity and a striving after wind.