言语的力量可以搭建桥梁也可以烧毁它们；明智地选择吧。

Mathematics is not a spectator sport. You have to get involved.

Make women rational creatures, and free citizens, and they will quickly become good wives and mothers.

每个数学问题都有解决方案，但并非每个解决方案都显而易见。

世界上有开朗的悲观主义者吗？我就是这样的人。