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

To feel much for others and little for ourselves； to restrain our selfishness and exercise our benevolent affections， constitute the perfection of human nature.

统计学的最终目标是从数据中提取信息。

过去是一个陌生的国度；那里的人做事方式不同。