实现明天的唯一限制是我们今天的疑虑。
孩子需要爱，尤其是当他们不值得被爱的时候。
Mathematics is the art of giving the same name to different things.
On choosing friends: "Life's too short to hang out with people who aren't resourceful."
学习新编程语言的唯一方法是用它编写程序。