Maybe happiness is this: not feeling like you should be elsewhere, doing something else, being someone else.

In the presence of total Darkness, the mind finds it absolutely necessary to create light.

Science is a set of rules to keep us from telling lies to each other. All scientists really have is a reputation for telling the truth.

And above all things, never think that you're not good enough yourself. A man should never think that. My belief is that in life people will take you at your own reckoning.

Man's greatest asset is the unsettled mind.

Modern science fiction is the only form of literature that consistently considers the nature of the changes that face us.

I never considered myself a patriot. I like to think I recognize only humanity as my nation.