One way of assessing the toxicity of a drug is how do you feel the next day?

The word 'self' is as great a mystery as the word 'other'. It's just a polarity between two mysteries.

I believe in extraterrestrials, but I believe that real extraterrestrials are so peculiar that the job is to recognize them.

But what I really am interested in is not the end of the world but everything which precedes it.

It's as important to be well informed in this area, if you're going to do it, as it is to be well informed about procedures in skin diving and that sort of thing if you're going to do that.

We cannot evolve faster than our language. The edge of being is the edge of meaning, and somehow we have to push the edge of meaning. We have to extend it.

The 'hard swallow' built into science is this business about the Big Bang. ... This is the notion that the universe, for no reason, sprang from nothing in a single instant. ... Notice that this is the limit test for credulity. . . . It's the limit case for likelihood.