A "critic" is a man who creates nothing.

Never tease an old dog; he might have one bite left.

One could write a history of science in reverse by assembling the solemn pronouncements of highest authority about what could not be done and could never happen.

I wanted the feeling of romance and the sense of wonder I had known as a kid. I wanted the world to be what they had promised me it was going to be - instead of the tawdry, lousy fouled-up mess it is.

On two subjects the overwhelming majority of people regarded their own opinions as Absolute Truth, and sincerely believed that anyone who disagreed with them was immoral, outrageous, sinful, sacrilegious, offensive, intolerable, stupid, illogical, treasonable, actionable, against the public interest, ridiculous, and obscene. The two subjects were (of course) sex and religion.

Unarmed hand-to-hand fighting does not change through the ages; only the name changes, and it has only one rule: do it first, do it fast, do it dirtiest.

All my enemies are self-appointed.