And what greater might do we possess as human beings than our capacity to question and to learn?

If you have a beating heart, that's good enough.

The only gratification that science denies to us is deception.

This planet seems to be in such sorry shape. And I can't ever think about the rest of the universe without coming back home and thinking what the implications for life here would be if we were to really have some definitive proof of extraterrestrial life.

No single step in the persuit of enlightenment should ever be considered sacred; only the search was.

Carl took on the military-industrial complex. He campaigned around the world for an end to the production of weapons of mass destruction. To him it was a perversion of science.

Interviewer: "Didn't [Sagan] want to believe?" Druyan: "He didn't want to believe. He wanted to know.