一个数学家的真正价值在于他们留下的问题。

The way we frame a problem can greatly influence the solutions we come up with.

You don't get another chance, life is no Nintendo game.

Happiness in this world, when it comes, comes incidentally. Make it the objet of pursuit, and it leads us a wild-goose chase, and is never attained. Follow some other object, and very possibly we may find that we have cought happiness without dreaming of it.