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Watch your thoughts, for they become words. Watch your words, for they become actions. Watch your actions, for they become habits. Watch your habits, for they become your character. And watch your character, for it becomes your destiny. What we think, we become.
如果你无法简单地解释它,说明你理解得还不够透彻。
Don't be afraid to give up the good to go for the great.
最好的数学不仅正确,而且具有启发性。
智者从敌人身上学到的比愚者从朋友身上学到的更多。