The cost of trying is the lowest.

The beauty of a mathematical idea is that it can be shared and understood across cultures and time.

The best ideas come from collaboration, not isolation.

最好的采石场不会留下伤痕，只有负责任的转变。

In the end, I've found that it doesn't really matter who you marry. If you like them at the beginning, you probably won't like them at the end. And if you start off hating them, there's always the chance you'll end up thinking they're all right.