Promises are like crying babies in a theater, they should be carried out at once.

Instinct is a marvellous thing. It can neither be explained nor ignored.

He who chooses the beginning of the road chooses the place it leads to.

Not everything that can be counted counts, and not everything that counts can be counted.

To kill an error is as good a service as, and sometimes even better than, the establishing of a new truth or fact

If we know exactly where we're going, exactly how to get there, and exactly what we'll see along the way, we won't learn anything.

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

Strength does not come from physical capacity. It comes from an indomitable will.

The absent are never without fault, nor the present without excuse.

There are four ways, and only four ways, in which we have contact with the world. We are evaluated and classified by these four contacts: what we do, how we look, what we say, and how we say it.

He alone is free who lives with free consent under the entire guidance of reason.

Experience is the only prophecy of wise men.

There is geometry in the humming of the strings. There is music in the spacing of the spheres.

We sometimes congratulate ourselves at the moment of waking from a troubled dream; it may be so the moment after death.

Madame, all stories, if continued far enough, end in death, and he is no true-story teller who would keep that from you.

Good advice is always certain to be ignored, but that's no reason not to give it.

There are two educations. One should teach us how to make a living and the other how to live.

Wonder is the beginning of wisdom.

In a good bookroom you feel in some mysterious way that you are absorbing the wisdom contained in all the books through your skin, without even opening them.

The wise man should restrain his senses like the crane and accomplish his purpose with due knowledge of his place, time and ability.

I've learned that people will forget what you said, people will forget what you did, but people will never forget how you made them feel.