The less respect an older person deserves the more certain he is to demand it from anyone younger.

You got the impression that he never needed to sleep - just ten-thousand-mile checkups and dust him off occasionally.

Sin is cruelty and injustice, all else is peccadillo. Oh, a sense of sin comes from violating the customs of your tribe. But breaking custom is not sin even when it feels so; sin is wronging another person.

The more you love, the more you can love - and the more intensely you love.

The whole principle (censorship) is wrong; it's like demanding that grown men live on skim milk because the baby can't eat steak.

A handy short definition of almost all science fiction might read: realistic speculation about possible future events, based solidly on adequate knowledge of the real world, past and present, and on a thorough understanding of the nature and significance of the scientific method.

You can go wrong by being too skeptical as readily as by being too trusting.