The secret of genius is to carry the spirit of the child into old age, which means never losing your enthusiasm.

An intellectual is a person who’s found one thing that’s more interesting than sex.

Beauty is worse than wine, it intoxicates both the holder and beholder.

The deepest sin against the human mind is to believe things without evidence.

No social stability without individual stability.

If most of us remain ignorant of ourselves, it is because self-knowledge is painful and we prefer the pleasures of illusion.

Facts do not cease to exist because they are ignored.

An intellectual is a person who’s found one thing that’s more interesting than sex.

Every man’s memory is his private literature.

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

Never put off till tomorrow the fun you can have today.

Experience teaches only the teachable.

Technological progress has merely provided us with more efficient means for going backwards.

In life, man proposes, God disposes.

You shall know the truth, and the truth shall make you mad.

Medical science is making such remarkable progress that soon none of us will be well.

Consistency is contrary to nature, contrary to life. The only completely consistent people are the dead.

A love of nature keeps no factories busy.

If most of us remain ignorant of ourselves, it is because self-knowledge is painful and we prefer the pleasures of illusion.

Maybe this world is another planet’s hell.