抓紧时间，孩子们，让你的生命不同寻常。

数学是理性的音乐。

Your time is limited, so don't waste it living someone else's life.

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.