规范是命令、允许或授权某种行为的行动的意义。

Life is an adventure, and survival is the art of navigating through it.

The existence of a legal system is a matter of social fact.

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.