Sagan based a large amount of his career around discrediting the idea that science was cold and impersonal, and as such, he included many of these in his work.
In an episode of Star Trek: Enterprise, the characters land at Carl Sagan Memorial Station on Mars. The memorial at the station carries a particularly good quote of Sagan's.
"Whatever the reason you're on Mars, I'm glad you're there, and I wish I was with you."
In late 1975, Sagan personally invited a young Neil Degrasse Tyson, who was applying to college at the time, to discuss whether Cornell University would be right for him. Afterwards, he gave him an autographed book, and because it was very snowy, offered his phone number in case Neil needed help getting home. He still has that book, with the autograph, long after Sagan's death in 1996. In Cosmos: A Spacetime Odyssey, Tyson even says that Sagan was the person who inspired him to become an astrophysicist in the first place.
Tyson: I already knew I wanted to be a scientist. But that afternoon, I learned from Carl about the person I wanted to become.
Sagan's ardent soliloquies about protecting and cherishing the "only home we got":
The Earth is the only world known so far to harbor life. There is nowhere else, at least in the near future, to which our species could migrate. Visit, yes. Settle, not yet. Like it or not, for the moment the Earth is where we make our stand. It has been said that astronomy is a humbling and character-building experience. There is perhaps no better demonstration of the folly of human conceits than this distant image of our tiny world. To me, it underscores our responsibility to deal more kindly with one another, and to preserve and cherish the pale blue dot, the only home we've ever known.
Every one of us is, in the cosmic perspective, precious. If a human disagrees with you, let him live. In a hundred billion galaxies, you will not find another.
The surface of the earth is the shore of the cosmic ocean. On this shore we've learned most of what we know. Recently we've waded a little way out, maybe ankle-deep, and the water seems inviting...