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真相就像一头狮子;你不需要为它辩护。放开它;它会自己辩护。
The essence of mathematics lies in its freedom.
The true teacher defends his pupils against his own personal influence. He inspires self-trust. He guides their eyes from himself to the spirit that quickens him. He will have no disciple.
The books that the world calls immoral are books that show the world its own shame.