Then I looked on all the works that my hands had wrought, and on the labour that I had laboured to do: and, behold, all was vanity and vexation of spirit, and there was no profit under the sun.(Ecclesiastes 2:11)

And I turned myself to behold wisdom, and madness, and folly: for what can the man do that cometh after the king? even that which hath been already done.(Ecclesiastes 2:12)

Then I saw that wisdom excelleth folly, as far as light excelleth darkness.(Ecclesiastes 2:13)

The wise man's eyes are in his head; but the fool walketh in darkness: and I myself perceived also that one event happeneth to them all.

Then said I in my heart, As it happeneth to the fool, so it happeneth even to me; and why was I then more wise? Then I said in my heart, that this also is vanity.(Ecclesiastes 2:15)

For there is no remembrance of the wise more than of the fool for ever; seeing that which now is in the days to come shall all be forgotten. And how dieth the wise man? as the fool.(Ecclesiastes 2:16)

Therefore I hated life; because the work that is wrought under the sun is grievous unto me: for all is vanity and vexation of spirit.(Ecclesiastes 2:17)

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Ecclesiastes 2:14 - Cross Reference

It is better to go to the house of mourning, than to go to the house of feasting: for that is the end of all men; and the living will lay it to his heart. (Ecclesiastes 7:2)

I returned, and saw under the sun, that the race is not to the swift, nor the battle to the strong, neither yet bread to the wise, nor yet riches to men of understanding, nor yet favour to men of skill; but time and chance happeneth to them all. (Ecclesiastes 9:11)

For he seeth that wise men die, likewise the fool and the brutish person perish, and leave their wealth to others. (Psalm 49:10)

For all this I considered in my heart even to declare all this, that the righteous, and the wise, and their works, are in the hand of God: no man knoweth either love or hatred by all that is before them. (Ecclesiastes 9:1)

But he that hateth his brother is in darkness, and walketh in darkness, and knoweth not whither he goeth, because that darkness hath blinded his eyes. (1 John 2:11)

More to be desired are they than gold, yea, than much fine gold: sweeter also than honey and the honeycomb. (Psalm 19:10)

The wisdom of the prudent is to understand his way: but the folly of fools is deceit. (Proverbs 14:8)

A wise man's heart is at his right hand; but a fool's heart at his left. (Ecclesiastes 10:2)

Yea, though he live a thousand years twice told, yet hath he seen no good: do not all go to one place? (Ecclesiastes 6:6)

Who is as the wise man? and who knoweth the interpretation of a thing? a man's wisdom maketh his face to shine, and the boldness of his face shall be changed. (Ecclesiastes 8:1)

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. (Ecclesiastes 3:19)

Then said I, Wisdom is better than strength: nevertheless the poor man's wisdom is despised, and his words are not heard. (Ecclesiastes 9:16)

Wisdom is before him that hath understanding; but the eyes of a fool are in the ends of the earth. (Proverbs 17:24)