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The most beautiful as well as the most ugly inclinations of man are not part of a fixed biologically given nature, but result from the social process which creates man.

Freedom is what you do with what's been done to you.

The study of mental processes requires both experimental and comparative methods.

預測未來的最好方式就是創造未來。

過去是一個異國；他們在那里做事的方式不同。