A good world needs knowledge， kindliness， and courage； it does not need a regretful hankering after the past or a fettering of the free intelligence by the words uttered long ago by ignorant men.

Success is measured not just by profit, but by positive impact.

世界因你的榜样而改变，而不是因你的意见。

学习一种新编程语言的唯一方法是用它编写程序。