If all the statisticians in the world were laid head to toe, they wouldn't be able to reach a conclusion

The notion that inspiration is something that happened thousands of years ago, and was then finished and done with. . . the theory that God retired from business at that period and has not been heard from since, is as silly as it is blasphemous.

A critic is one who leaves no turn unstoned.

At present, intelligent people do not have their children vaccinated, nor does the law now compel them to. The result is not, as the Jennerians prophesied, the extermination of the human race by smallpox; on the contrary more people are now killed by vaccination than by smallpox.

My friend, when a man has anything to tell in this world, the difficulty is not to make him tell it, but to prevent him from telling it too often.

The mathematician is fascinated with the marvelous beauty of the forms he constructs, and in their beauty he finds everlasting truth.

I believe in the discipline of silence, and could talk for hours about it.