Those who can not change their minds can not change anything.

The difference between stupidity and genius is that genius has its limits.

What's real and what's true aren't necessarily the same.

Do not say a little in many words, but a great deal in few!

We are all born ignorant, but one must work hard to remain stupid

Obsession is the wellspring of genius and madness.

Science may set limits to knowledge, but should not set limits to imagination.

Share our similarities, celebrate our differences.

The boundaries which divide Life from Death are at best shadowy and vague. Who shall say where the one ends, and where the other begins?

Nobody has the power to take two steps together; you can take only one step at a time.

Drop the idea of becoming someone, because you are already a masterpiece. You cannot be improved. You have only to come to it, to know it, to realize it.

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.

A good teacher protects his pupils from his own influence.

As our case is new, we must think and act anew.

It is always advisable to perceive clearly our ignorance.

He who conquers others is strong; he who conquers himself is mighty.

You always admire what you really don't understand.

It takes a great man to be a good listener.

Only from the heart can you touch the sky.

He who is slowest in making a promise is most faithful in its performance.

How often I found where I should be going only by setting out for somewhere else.