先验真理并不一定是独立于经验而知的真理。
大多数人害怕变化，但如果你把它看成是某种你总是可以依赖的东西的话，那它就能成为一种安慰。世上你能依赖的东西并不是很多。
Modern quarrying must marry the wisdom of geology with the innovation of engineering.
The only way to learn mathematics is to do mathematics.
When you live for others' opinions, you are dead.
Never let your sense of morals prevent you from doing what is right.
日常生活中的家事，儿童都非常喜欢参与。