我不是悲观主义者，我是一个受过悲观主义训练的乐观主义者。

选择不够精当，叙述不够详尽

Mathematics is not a careful march down a well-cleared highway, but a journey into a strange wilderness, where the explorers often get lost.

I'm not a person who looks back. I'm always looking forward.

任何重复性活动（如惩罚犯罪或葬礼仪式）的功能，在于它在整体社会生活中扮演的角色，从而对维持结构连续性所做的贡献。