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 words of truth are simple.

Invention is the mother of necessity.

The very existence of libraries affords the best evidence that we may yet have hope for the future of man.

"What is a poet? An unhappy person who conceals profound anguish in his heart but whose lips are so formed that as sighs and cries pass over them they sound like beautiful music."

发现可能性的极限的唯一方法就是超越它们，进入不可能。