成功绝非偶然。它是努力、坚持、学习、牺牲，最重要的是热爱你所做的事情。

数学研究是具体与抽象之间不断的对话。

Learn how to tie a bowline knot. Practice in the dark. With one hand. For the rest of your life you’ll use this knot more times than you would ever believe.

There was never a century nor a country that was short of experts who knew the Deity's mind and were willing to reveal it.

The study of black holes has revolutionized our understanding of space and time.