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.

One theory which can no longer be taken very seriously is that UFOs are interstellar spaceships.

Open the pod bay doors, Hal.

Civilization will reach maturity only when it learns to value diversity of character and of ideas.

As his body became more and more defenseless, so his means of offense became steadily more frightful.

It is really quite amazing by what margins competent but conservative scientists and engineers can miss the mark, when they start with the preconceived idea that what they are investigating is impossible.

I've been saying for a long time that I'm hoping to find intelligent life in Washington.