The moral difference between a soldier and a civilian is that the soldier accepts personal responsibility for the safety of the body politic of which he is a member. The civilian does not.

What are the facts? Again and again and again – what are the facts? Shun wishful thinking, ignore divine revelation, forget what “the stars foretell,” avoid opinion, care not what the neighbors think, never mind the unguessable “verdict of history” – what are the facts, and to how many decimal places? You pilot always into an unknown future; facts are your single clue. Get the facts!

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.

Talking with a Martian is like talking with an echo. You don't get argument but you don't get results.

You have to give an editor something to change, or he gets fretful. After he pees in it, he likes the flavor better, so he buys it.

We learned not to waste ammo even on warriors except in self-protection

When one teaches, two learn.