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

The Earth is just too small and fragile a basket for the human race to keep all its eggs in.

You can have peace. Or you can have freedom. Don't ever count on having both at once.

In Wilson's scale of evaluations breakfast rated just after life itself and ahead of the chance of immortality.

The purpose of war is to support your government's decisions by force.

People who are busy and happy don't write diaries; they are too busy living.

Spacemen die if they stay in one place.