最深刻的真理往往是我们忽略的那些。
The most profound truths are often the ones we overlook.
The most profound ideas in mathematics often arise from the simplest observations.
挑战让我们成长;用勇气和决心去迎接它们。
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.