A well-stocked mind is safe from boredom.

Any path to knowledge is a path to God-or Reality, whichever word one prefers to use

When one has to ask, "Am I really in love?" the answer is always "No".

Magic's just science that we don't understand yet.

That's one of those meaningless and unanswerable questions the mind keeps returning to endlessly, like the tongue exploring a broken tooth.

When I start on a book, I have been thinking about it and making occasional notes for some time... So I have lots of theme, locale, subjects and technical ideas... I don't worry about long periods of not doing anything. I know my subconscious is busy.

Attempting to define science fiction is an undertaking almost as difficult, though not so popular, as trying to define pornography... In both pornography and SF, the problem lies in knowing exactly where to draw the line.