Logic is a feeble reed, friend. "Logic" proved that airplanes can't fly and that H-bombs won't work and that stones don't fall out of the sky. Logic is a way of saying that anything which didn't happen yesterday won't happen tomorrow.

Never worry about theory as long as the machinery does what it's supposed to do.

A touchstone to determine the actual worth of an "intellectual" - find out how he feels about astrology.

I've found out why people laugh. They laugh because it hurts- because it's the only thing that'll make it stop hurting... I had been told that a 'funny' thing is a thing of goodness. It isn't... The goodness is in the laughing. I grok it is a bravery- and a sharing- against pain and sorrow and defeat.

He never gave up his search for the Door into Summer.

If it can't be expressed in figures, it is not science; it is opinion. It has long been known that one horse can run faster than another - but which one? Differences are crucial.

When a place gets crowded enough to require ID's, social collapse is not far away. It is time to go elsewhere. The best thing about space travel is that it made it possible to go elsewhere.