I can calculate the motion of heavenly bodies but not the madness of people.

People seldom do what they believe in. They do what is convenient, then repent.

In spite of everything, I still believe that people are really good at heart.

A woman's chastity consists, like an onion, of a series of coats.

People demand freedom of speech as a compensation for the freedom of thought which they seldom use.

Great men are like eagles, and build their nest on some lofty solitude.

There is no come back to caves. We are too many.

It is no measure of health to be well adjusted to a profoundly sick society.

A question that sometimes drives me hazy: Am I, or the others, crazy?

We may have different religions, different languages, different colored skin, but we all belong to one human race.

A man's feet should be planted in his country, but his eyes should survey the world.

All is in the hands of man. Therefore wash them often.

Of mankind we may say in general they are fickle, hypocritical, and greedy of gain.

A man sooner or later discovers that he is the master-gardener of his soul, the director of his life.

You may turn into an archangel, a fool, or a criminal ? no one will see it. But when a button is missing?everyone sees that.

A wise man can play the part of a clown, but a clown can't play the part of a wise man.

Progress of mankind is progress of mind and intellect.

Human nature is not totally fixed, but on any realistic scale, evolutionary processes are much too slow to affect it.

I just invent, then wait until man comes around to needing what I've invented.

One can choose to go back toward safety or forward toward growth. Growth must be chosen again and again; fear must be overcome again and again.

If you want to know what a man's like, take a good look at how he treats his inferiors, not his equals.