One thing I have learned in a long life: that all our science, measured against reality, is primitive and childlike -- and yet it is the most precious thing we have.

He who finds a thought that lets us a little deeper into the eternal mystery of nature has been granted great peace.

The best design is the simplest one that works.

The future is an unknown, but a somewhat predictable unknown. To look to the future we must first look back upon the past. That is where the seeds of the future were planted. I never think of the future. It comes soon enough.

I regard class differences as contrary to justice and, in the last resort, based on force.

... it is a welcome symptom in an age which is commonly denounced as materialistic, that it makes heroes of men whose goals lie wholly in the intellectual and moral sphere.

The mathematician knows some things, no doubt, but not those things one usually wants to get from him.