It is hard to fight desire; but to control it is the sign of a reasonable man.

An understanding of the natural world is a source of not only great curiosity, but great fulfilment.

The only limit to our realization of tomorrow will be our doubts of today.

When you undervalue what you do, the world will undervalue who you are

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

Circumstances do not make a man, they reveal him.

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

If you only read the books that everyone else is reading, you can only think what everyone else is thinking.

There is nothing more uncommon than common sense.

Reality leaves a lot to the imagination.

Immoderate desire is the mark of a child, not a man.

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

The pendulum of the mind oscillates between sense and nonsense, not between right and wrong.

What a man does for others, not what they do for him, gives him immortality.

Do your little bit of good where you are; it's those little bits of good put together that overwhelm the world.

When prosperity comes, do not use all of it.

If you don't behave as you believe, you will end by believing as you behave.

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

It is better to remain silent and be thought a fool than to open one's mouth and remove all doubt.

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

This is something basic to be understood: the ego must come to a peak, it must be strong, it must have attained an integrity only then can you dissolve it.