走向自由,不管在哪,都没有轻松的道路;多数人在到达渴望的巅峰之前,都必须一次又一次穿过被死亡阴影所垄罩的幽暗山谷。
The principle goal of education is to create men who are capable of doing new things, not simply of repeating what other generations have done.
数学的本质不是把简单的事情复杂化,而是把复杂的事情简单化。