一个人的首要职责是为自己思考。
The first duty of a man is to think for himself.
The most important thing about a theory is that it explains the facts.
Language is a skin: I rub my language against the other. It is as if I had words instead of fingers, or fingers at the tips of my words.
The most damaging phrase in the language is: 'We've always done it this way.'
The first fruit of this imagination - and the first lesson of the social science that embodies it - is the idea that the individual can understand his own experience and gauge his own fate only by locating himself within his period, that he can know his own chances in life only by becoming aware of those of all individuals in his circumstances.