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"The nitrogen in our DNA, the calcium in our teeth, the iron in our blood, the carbon in our apple pies were made in the interiors of collapsing stars. We are made of starstuff."
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"At the end of all spiritual paths, there lies only a cold graveyard; the path of science is the only path that may give you something better than this!"

"There are stars in the night sky that look brighter than the others, and when you look at them through a telescope you realize you are looking at twins. The two stars rotate around each other, sometimes taking nearly a hundred years to do it. They create so much gravitational pull there's no room around for anything else. You might see a blue star, for example, and realize only later that it has a white dwarf as a companion - that first one shines so bright, by the time you notice the second one, it's too late."

"No definite sciencewithout trial & error."

"Science is knowledge meeting humility meeting curiosity: ever-evolving, always learning. Atheism is often but knowledge meeting arrogance: a masquerade under the wing of the beauty of science. Religion is infamously a weight under the one wing; then under the other is atheism, the championed masquerade."

"The ratio of feed to flesh in chicken, the most efficient animal by this measure, is two pounds of corn to one of meat, which is why chicken costs less than beef."

"Where ignorance lurks, so too do the frontiers of discovery and imagination."
Explore more quotes by Carl Sagan

"When we look up at night and view the stars, everything we see is shinning because of distant nuclear fusion."

"But if they called everything divine which they do not understand, why, there would be no end of divine beings."

"You could just as well say that an agnostic is a deeply religious person with at least a rudimentary knowledge of human fallibility."

"We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology."

"The time scale for evolutionary or genetic change is very long. A characteristic period for the emergence of one advanced species from another is perhaps a hundred thousand years; and very often the difference in behavior between closely relatedspecies-say, lions and tigers-do not seem very great... But today we do not have ten million years to wait for the next advance. We live in a time when our world is changing at an unprecedented rate. While the changes are largely of our own making, they cannot be ignored. We must adjust and adapt andcontrol, or we perish."

"In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion."

"The vast distances that separate the stars are providential. Beings and worlds are quarantined from one another. The quarantine is lifted only for those with sufficient self-knowledge and judgment to have safely traveled from star to star."

"However, in part for reasons of organizationalconvenience, modern societies are structured as if all humans had the same sleep requirements; and in many parts of the world there is a satisfying sense of moral rectitude in rising early. The amount of sleep required for buffer dumping would then depend on how much we have both thought and experienced since the last sleep period."

"If you want to save your child from polio, you can pray or you can inoculate. ... Choose science."

"We all have a thirst for wonder. It's a deeply human quality. Science and religion are both bound up with it. What I'm saying is, you don't have to make stories up, you don't have to exaggerate. There's wonder and awe enough in the real world. Nature's a lot better at inventing wonders than we are."
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