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最大的悲劇是普通人的悲劇。

As long as man continues to be the ruthless destroyer of lower living beings， he will never know health or peace. For as long as men massacre animals， they will kill each other.

The only people who see the whole picture are the ones who step out of the frame.

Behavior, as such, is not to be regarded as a mere chain of muscular contractions, but rather as a purposive and cognitive affair.

研究心靈就是研究生存的策略。