宇宙不仅比我们想象的更奇怪，它比我们能想象的还要奇怪。

Mathematics is not a spectator sport.

The will to learn is an intrinsic motive, one that finds both its source and its reward in its own exercise.

When one door is closed, don't you know, another is open.

The only person you should try to be better than is the person you were yesterday.