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"Avoidable human misery is more often caused not so much by stupidity as by ignorance, particularly our ignorance about ourselves."
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"Indoctrination is not just demeaning to the human conscience, it is lethal for the flourishing psychology of the hungry, young mind."

"Shame lies. All the time. About everything. Don't believe your shame."

"I said to him, "Shall I tell you where the men are who believe most in themselves? For I can tell you. I know of men who believe in themselves more colossally than Napoleon or Caesar. I know where flames the fixed star of certainty and success. I can guide you to the thrones of the Super-men. The men who really believe in themselves are all in lunatic asylums."

"Nothing will ever be solved if we wallow in the darkness of denial."

"Her mind is an unquiet one, words and thoughts and impulses constantly crashing into each other."

"[If a man] postpone[s] any open acknowledgement... that his own faith is in direct opposition to the assumptions on which all the conversation of his new friends [are] based... he will be in a false position. He will be silent when he ought to speak and laugh when he ought to be silent. He will assume, at first only by his manner, but presently by his words, all sorts of cynical and sceptical attitudes which are not really his. But... they may become his. All mortals tend to turn into the thing they are pretending to be."

"I was living for one thing only, and that was to confirm my own lack of feeling."

"People don't want to think. And the deeper they get into trouble, the less they want to think. But by some sort of instinct, they feel that they ought to and it makes them feel guilty. So they'll bless and follow anyone who gives them a justification for not thinking. Anyone who makes a virtue - a highly intellectual virtue - out of what they know to be their sin, their weakness and their guilt... They envy achievement, and their dream of greatness is a world where all men have become their acknowledged inferiors. They don't know that that dream is the infallible proof of mediocrity, because that sort of world is what the man of achievement would not be able to bear."

"Human brain is structured to avoid any kind of refutation of one's religious beliefs."

"We are what we believe we are."
Explore more quotes by Carl Sagan

"Who are we? We find that we live on an insignificant planet of a humdrum star lost in a galaxy tucked away in some forgotten corner of a universe in which there are far more galaxies than people."

"The Man in the Moon is in fact a record of ancient catastrophes--most of which took place before humans, before mammals, and probably even before life arose on Earth. It is a characteristic conceit of our species to put a human face on random cosmic violence."

"Once upon a time, we soared into the Solar System. For a few years. Then we hurried back. Why? What happened? What was 'Apollo' really about?"

"It is certainly true that all beliefs and all myths are worthy of a respectful hearing. It is not true that all folk beliefs are equally valid - if we're talking not about an internal mindset, but about understanding of the external reality."

"But I try not to think with my gut. If I'm serious about understanding the world, thinking with anything besides my brain, as tempting as that might be, is likely to get me into trouble."

"In its encounter with Nature, science invariably elicits a sense of reverence and awe. The very act of understanding is a celebration of joining, merging, even if on a very modest scale, with the magnificence of the Cosmos. And the cumulative worldwide build-up of knowledge over time converts science into something only a little short of a trans-national, trans-generational meta-mind."

"The Cosmos extends, for all practical purposes, forever. After a brief sedentary hiatus, we are resuming our ancient nomadic way of life. Our remote descendants, safely arrayed on many worlds throughout the Solar System and beyond, will be unified by their common heritage, by their regard for their home planet, and by the knowledge that, whatever other life may be, the only humans in all the Universe come from Earth. They will gaze up and strain to find the blue dot in their skies. They will love it no less for its obscurity and fragility. They will marvel at how vulnerable the repository of all our potential once was, how perilous our infancy, how humble our beginnings, how many rivers we had to cross before we found our way."

"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?"

"I think the discomfort that some people feel in going to the monkey cages at the zoo is a warning sign."

"If we long for our planet to be important, there is something we can do about it. We make our world significant by the courage of our questions and by the depth of our answers."
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