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The study of cognition is the study of how human beings understand their world.

The most important tool an artist has is curiosity.

The right of a nation to kill a tyrant in case of necessity can never be doubted.

I do not write to confess, but to explore the limits of the sayable.

"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."

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.

生命中最偉大的榮耀不在于永不跌倒，而在于每次跌倒后都能站起來。