I am an optimist. Anyone interested in the future has to be otherwise he would simply shoot himself.

The inspirational value of the space program is probably of far greater importance to education than any input of dollars... A whole generation is growing up which has been attracted to the hard disciplines of science and engineering by the romance of space.

Any path to knowledge is a path to God-or Reality, whichever word one prefers to use

Good morning, Dr. Chandra. This is Hal. I am ready for my first lesson.

There is a special sadness in achievement, in the knowledge that a long-desired goal has been attained at last, and that life must now be shaped toward new ends.

After their encounter on the approach to Jupiter, there would aways be a secret bond between them---not of love, but of tenderness, which is often more enduring.

You can't have it both ways. You can't have both free will and a benevolent higher power who protects you from yourself.