Activity is the only road to knowledge.

Every doctor will allow a colleague to decimate a whole countryside sooner than violate the bond of professional etiquette by giving him away.

It's easier to replace a dead man than a good picture.

A man's interest in the world is only the overflow from his interest in himself. When you are a child your vessel is not yet full;so you care for nothing but your own affairs. When you grow up, your vessel overflows; and you are a politician, a philosopher, or an explorer and adventurer. In old age the vessel dries up: there is no overflow: you are a child again.

When the world goes mad, one must accept madness as sanity; since sanity is, in the last analysis, nothing but the madness on which the whole world happens to agree.

No doubt it is easy to demostrate that property will destroy society unless society destroys it.

When the horrors of anarchy force us to set up laws that forbid us to fight and torture one another for sport, we still snatch at every excuse for declaring individuals outside the protection of law and torturing them to our hearts content.