The greatest weapons in the conquest of knowledge are an understanding mind and the inexorable curiosity that drives it on.

It is change, continuing change, inevitable change, that is the dominant factor in society today. No sensible decision can be made any longer without taking into account not only the world as it is, but the world as it will be. This, in turn, means that our statesmen, our businessmen, our every man must take on a science fictional way of thinking.

Life is pleasant. Death is peaceful. It's the transition that's troublesome.

No sensible decision can be made any longer without taking into account not only the world as it is, but the world as it will be.

I don't believe in an afterlife, so I don't have to spend my whole life fearing hell, or fearing heaven even more. For whatever the tortures of hell, I think the boredom of heaven would be even worse.

I don't subscribe to the thesis, 'Let the buyer beware,' I prefer the disregarded one that goes, 'Let the seller be honest.'

I made up my mind long ago to follow one cardinal rule in all my writing — to be clear.