人类心智形成和操纵符号的能力使我们区别于其他动物。

世界的问题在于愚蠢的人自以为是，而聪明的人充满怀疑。

No wise pilot, no matter how great his talent and experience, fails to use a checklist.

The dead are always listening. The dead are always watching.

数学家是将咖啡转化为定理的装置。