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No man really knows about other human beings. The best he can do is to suppose that they are like himself.
永远不要停止学习,因为世界永远不会停止变化。
The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool; the truest heroism is to resist the doubt; and the profoundest wisdom, to know when it ought to be resisted, and when it be obeyed.