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The revolution is not an apple that falls when it is ripe. You have to make it fall.
The important thing in science is not so much to obtain new facts as to discover new ways of thinking about them.
A classic is a book that has never finished saying what it has to say.
人一定要懂得“礼”之后才能产生恭敬之心,产生恭敬之心以后才能有所尊敬,有所礼让。