At twenty a man is full of fight and hope. He wants to reform the world. When he is seventy he still wants to reform the world, but he knows he can't

For the greatest revolutionary changes on this earth would not have been thinkable if their motive force, instead of fanatical, yes, hysterical passion, had been merely the bourgeois virtues of law and order

The greatest revolution of our generation is the discovery that human beings, by changing the inner attitudes of their minds, can change the outer aspects of their lives

In art, all who have done something other than their predecessors have merited the epithet of revolutionary; and it is they alone who are masters