The very existence of libraries affords the best evidence that we may yet have hope for the future of man.
The great question which, in all ages, has disturbed mankind, and brought on them the greatest part of their mischiefs, has been, not whether there be power in the world, nor whence it came, but who should have it.
科学家最强大的工具是开放的思维。
The hardest thing is to live richly in the present without letting it be tainted by the past or future.