I communed with mine own heart, saying, Lo, I have become great and have acquired wisdom more than all they that have been before me over Jerusalem; and my heart hath seen much of wisdom and knowledge.

I searched in my heart how to cherish my flesh with wine, while practising my heart with wisdom; and how to lay hold on folly, till I should see what was that good for the children of men which they should do under the heavens all the days of their life.

And whatsoever mine eyes desired I kept not from them: I withheld not my heart from any joy; for my heart rejoiced in all my labour, and this was my portion from all my labour.

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

The heart of the wise is in the house of mourning, but the heart of fools in the house of mirth.

This is an evil among all that is done under the sun, that one thing befalleth all: yea, also the heart of the children of men is full of evil, and madness is in their heart while they live; and after that, they have to go to the dead.

The heart of a wise man is at his right hand; but a fool's heart at his left.

Rejoice, young man, in thy youth; and let thy heart cheer thee in the days of thy youth, and walk in the ways of thy heart, and in the sight of thine eyes; but know that for all these things God will bring thee into judgment.