…the greatest danger to man in space was man himself.

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.

One man's theology is another man's belly laugh.

One man's 'magic' is another man's engineering. 'Supernatural' is a null word.

I never learned from a man who agreed with me.

Never frighten a little man. He'll kill you.