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The essence of mathematics lies in its freedom.
我不是政治家。我是艺术家。我不必政治正确。
The freedom then of man, and liberty of acting according to his own will, is grounded on his having reason, which is able to instruct him in that law he is to govern himself by, and make him know how far he is left to the freedom of his own will.
The actions of men are the best interpreters of their thoughts.