"The world is full of obvious things which nobody by any chance ever observes."
世界上充满了显而易见的事情，却没有人注意到。
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.
The beauty of mathematics lies in its ability to simplify complex problems.
生活就是不断成长和进化。