If we cannot now end our differences, at least we can help make the world safe for diversity.

And the attitude of faith is the very opposite of clinging to belief, of holding on.

To do all that one is able to do, is to be a man; to do all that one would like to do, is to be a god.

Self-knowledge comes from knowing other men.

A hybrid human-robot mission to investigate an asteroid affords a realistic opportunity to demonstrate new technological capabilities for future deep-space travel and to test spacecraft for long-duration spaceflight.