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The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.
Mathematics is not a deductive science—that's a cliché. When you try to prove a theorem, you don't just list the hypotheses and then start to reason. What you do is trial and error, experimentation, guesswork.
The value or worth of a man is, as of all other things, his price; that is to say, so much as would be given for the use of his power.