Mathematics is not a spectator sport; to understand it, one must engage with it actively.

Abstraction allows for a kind of freedom that representation sometimes doesn't.

不过话得说回来，没有一桩事是容易的。

成功不是幸福的关键，幸福才是成功的关键。

I think that the most important thing is to be honest with yourself and with the audience.

The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.

"The greatest journeys are not measured in miles, but in understanding."