Anger begins in folly, and ends in repentance.

The only real mistake is the one from which we learn nothing.

Turn your wounds into wisdom.

If you only read the books that everyone else is reading, you can only think what everyone else is thinking.

Nothing is more intolerable than to have to admit to yourself your own errors.

Thoughts without content are empty, intuitions without concepts are blind.

I think, therefore I am.

The most certain sign of wisdom is cheerfulness.

In the practice of tolerance, one's enemy is the best teacher.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self.

Learning and wisdom are superfluities, the surface glitter merely, but it is the heart that is the seat of all power.

Beauty is not in the face; beauty is a light in the heart.

The road of excess leads to the palace of wisdom.

Accuracy is the twin brother of honesty; inaccuracy, of dishonesty.

Chaos is a name for any order that produces confusion in our minds.

No one cares how much you know, until they know how much you care

Men build too many walls and not enough bridges.

In order to change the world, you have to get your head together first

Those who know, do. Those that understand, teach.

The greatest power we have is the power of choice.

Colorless green ideas sleep furiously