Real knowledge is to know the extent of one's ignorance.

Tact is the knack of making a point without making an enemy.

Don't raise your voice, improve your argument.

Man is not the creature of circumstances, Circumstances are the creatures of men.

In any moment of decision, the best thing you can do is the right thing. The worst thing you can do is nothing.

If you do what you've always done, you'll get what you've always gotten.

All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.

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

If we don't believe in freedom of expression for people we despise, we don't believe in it at all.

Desire is the very essence of man.

What can't be cured must be endured.

Anywhere you go in the world is what you make of it, not what you read in books.

Destiny is not a passive agent that lies in the lap of the Gods, but is an active instrument that lies in your own hands to shape as you will.

Judge a man by his questions rather than by his answers.

A single lie destroys a whole reputation of integrity.

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

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

Don't expect to build up the weak by pulling down the strong.

There is a wisdom of the head, and... there is a wisdom of the heart.

Kind words don't cost much. Yet they accomplish much.

It is not enough to have a good mind; the main thing is to use it well.