Never do anything when you are in a temper, for you will do everything wrong.

Each problem that I solved became a rule which served afterwards to solve other problems.

Those who see the invisible can do the impossible.

It is always advisable to perceive clearly our ignorance.

It is necessary to keep one's compass in one's eyes and not in the hand, for the hands execute, but the eye judges.

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

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

Share our similarities, celebrate our differences.

In order to change the world, you have to get your head together first

Knowledge speaks, but wisdom listens

Mistakes are always forgivable, if one has the courage to admit them.

Fine clothes may disguise, but silly words will disclose a fool.

If we can really understand the problem, the answer will come out of it, because the answer is not separate from the problem.

Knowing is not enough, we must apply. Willing is not enough, we must do.

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?

The essence of knowledge is, having it, to apply it; not having it, to confess your ignorance.

Think no vice so small that you may commit it, and no virtue so small that you may over look it.

How often it is that the angry man rages denial of what his inner self is telling him.

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

I wanted to change the world. But I have found that the only thing one can be sure of changing is oneself.

Wrong life cannot be lived rightly.