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君子不用水来当镜子,而是拿别人来当镜子。用水当镜子可以看到的是容貌,用人当镜子则可以知道吉凶对错。
The beauty of mathematics is that it is a language that can describe the universe in a way that nothing else can.
生活是世界上最为罕见的事情。大多数人只是存在,仅此而已。
The goal of behavior is always the reduction of some drive or need.
The only thing necessary for the triumph of evil is for good men to do nothing.