1,131 Quotes by Carl Sagan

Anything else you’re interested in is not going to happen if you can’t breathe the air and drink the water. Don’t sit this one out. Do something. You are by accident of fate alive at an absolutely critical moment in the history of our planet.

You can’t convince a believer of anything; for their belief is not based on evidence, it’s based on a deep seated need to believe.

Cosmos is closed and light cannot escape from it, then it may be perfectly correct to describe the universe as a black hole. If you wish to know what it is like inside a black hole, look around you.

If we ruin the earth, there is no place else to go.

Science cuts two ways, of course; its products can be used for both good and evil. But there’s no turning back from science.

One of the great commandments of science is: ‘Mistrust arguments from authority.’

If intelligence is our only edge, we must learn to use it better, to shape it, to understand its limitations and deficiencies – to use it as cats use stealth, as katydids use camouflage – to make it the tool of our survival.

The Hindu religion is the only of the World’s great faiths dedicated to the idea that the Cosmos itself undergoes an immense, indeed an infinite, number of deaths and rebirths.

The wolf stands on its hind legs, places its forelegs on the scientist’s shoulders, and places its jaws around the scientist’s head. This is just the wolf’s way of being friendly. If you’re an animal who doesn’t know how to talk, a very clear signal is communicated: “See my teeth? Feel them? I could hurt you, I really could. But I won’t. I like you.