There is a road from the eye to the heart that does not go through the intellect.

There is no great genius without some touch of madness.

Wear your learning, like your watch, in a private pocket; and do not pull it out and strike it, merely to show that you have one.

Applause is the spur of noble minds, the end and aim of weak ones.

Intuition becomes increasingly valuable in the new information society precisely because there is so much data.

Knowledge is little; to know the right context is much; to know the right spot is everything.

Man's desires are limited by his perceptions; none can desire what he has not perceived.

How many pessimists end up by desiring the things they fear, in order to prove that they are right?

I prefer the errors of enthusiasm to the indifference of wisdom.

He who has begun has half done. Dare to be wise; begin!

An invasion of armies can be resisted, but not an idea whose time has come.

All intelligent thoughts have already been thought; what is necessary is only to try to think them again.

The mind's direction is more important than its progress.

It's bad taste to be wise all the time, like being at a perpetual funeral.

Nothing that is worth knowing can be taught.

I am not young enough to know everything.

To be ignorant of one's ignorance is the malady of the ignorant.

The art of being wise is the art of knowing what to overlook.

Reality is the other person's idea of how things should be.

Great ideas have a very short shelf life.