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The only person you should try to be better than is the person you were yesterday.
If you don't give up, you still have a chance. Giving up is the greatest failure.
Silence can be as powerful as words, if you know how to listen.
你给予的越多,他们索取的越多。
心理学家必须避免一切形式的还原论。
The mind is the most important thing in tennis.