Leadership means making tough decisions today that will benefit future generations.

Sorrow is hushed into peace in my heart like the evening among the silent trees。

缺少作恶的本能，往往使我不能做我所要做的事。

The best books are those that challenge you.

跟一个人相处了两个星期，不可能就此了解他究竟是怎样一个人。不过，要是我们不去尝试尝试，别人可少不了要尝试的。

数学中最深刻的思想往往源于最简单的观察。