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"A blade of grass is a commonplace on Earth; it would be a miracle on Mars. Our descendants on Mars will know the value of a patch of green. And if a blade of grass is priceless, what is the value of a human being?"
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"I had rather that the human race, having a certain quality in their lives, should continue for only a few centuries than that, losing freedom, friendship, dignity, and mercy, and learning to be quite content without them, they should continue for millions of millennia."

"And just look at these men: their eye saith it - they know nothing better on earth than to be with a woman.Filth is at the bottom of their souls, and alas! If their filth hath spirit in it!"

"Show that you care and share with those who are in need."

"Humility is one of the best expressions of self respect."
Explore more quotes by Carl Sagan

"Religions are often state-protected nurseries of pseudoscience, although there's no reason why religions have to play that role. In a way, it's an artefact from times long gone."

"But the fact that some geniuses were laughed at does not imply that all who are laughed at are geniuses. They laughed at Columbus, they laughed at Fulton, they laughed at the Wright Brothers. But they also laughed at Bozo the Clown."

"I am often amazed at how much more capability and enthusiasm for science there is among elementary school youngsters than among college students."

"The brain is like a muscle. When it is in use we feel very good. Understanding is joyous."

"All of the books in the world contain no more information than is broadcast as video in a single large American city in a single year. Not all bits have equal value."

"We've arranged a civilization in which most crucial elements profoundly depend on science and technology."

"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."

"Personally, I would be delighted if there were a life after death, especially if it permitted me to continue to learn about this world and others, if it gave me a chance to discover how history turns out."

"Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works."
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