I don't know, I don't care, and it doesn't make any difference.

Man is the only creature who refuses to be what he is.

It has seemed to be more necessary to have regard to the weight of words rather than to their number.

It is not the strength, but the duration, of great sentiments that makes great men.

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

It is a cliche that most cliches are true, but then like most cliches, that cliche is untrue.

You can be rich in spirit, kindness, love and all those things that you can't put a dollar sign on.

I mistrust the judgement of every man in a case in which his own wishes are concerned.

Boredom is the root of all evil - the despairing refusal to be oneself.

Science is organized knowledge. Wisdom is organized life.

Only idiots refuse to change their minds.

Adapt what is useful, reject what is useless, and add what is specifically your own.

There are no eternal facts, as there are no absolute truths.

Rational discussion is useful only when there is a significant base of shared assumptions.

Tell the truth. Sing with passion. Work with laughter. Love with heart. 'Cause that's all that matters in the end.

When you learn, teach, when you get, give.

Immoderate desire is the mark of a child, not a man.

Knowledge speaks, but wisdom listens

Learn from the mistakes of others. You can never live long enough to make them all yourself.

It is neither good nor bad, but thinking makes it so.

A friend to all is a friend to none