People are always blaming their circumstances for what they are. I don't believe in circumstances.

We don't stop playing because we grow old; we grow old because we stop playing.

Property, said Proudhon, is theft. This is the only perfect truism that has been uttered on the subject.

We know there is intention and purpose in the universe, because there is intention and purpose in us.

A lifetime of happiness! No man alive could bear it: it would be hell on earth.

Any man who is not a communist at the age of twenty is a fool. Any man who is still a communist at the age of thirty is an even bigger fool.

I have to live for others and not for myself: that's middle-class morality.