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.
垂直农业让我明白，限制常常会激发最明亮的创新。
Language is not just a tool for communication; it is a way of seeing the world.