Be silent or let thy words be worth more than silence.

All great achievements require time.

You laugh at me because I'm different, I laugh at you because you're all the same.

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

If we do not lay out ourselves in the service of mankind whom should we serve?

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

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

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

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

No one can make you feel inferior without your consent.

Choose rather to be strong of soul than strong of body.

The greatest of all mistakes is to do nothing because you think you can only do a little

Only idiots refuse to change their minds.

Let him who would move the world first move himself.

Medicine heals diseases of the body, wisdom frees the soul from passions.

Every intelligent individual wants to know what makes him tick, and yet is at once fascinated and frustrated by the fact that oneself is the most difficult of all things to know.

As the soft yield of water cleaves obstinate stone, So to yield with life solves the insolvable: To yield, I have learned, is to come back again.

Yes, I guess you could say I am a loner, but I feel more lonely in a crowed room with boring people than I feel on my own.

The ultimate authority must always rest with the individual's own reason and critical analysis.

Yesterday is but today's memory and tomorrow is today's dream.

Experience keeps a dear school, but fools will learn in no other.