Perhaps the depth of love can be calibrated by the number of different selves that are actively involved in a given relationship.
CARL SAGANThe significance of our lives and our fragile planet is then determined only by our own wisdom and courage.
More Carl Sagan Quotes
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The absence of evidence is not evidence of absence.
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One of the great commandments of science is: Mistrust arguments from authority.
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The price we pay for anticipation of the future is anxiety about it.
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Somewhere, something incredible is waiting to be known.
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Science is an attempt, largely successful, to understand the world, to get a grip on things, to get hold of ourselves, to steer a safe course.
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Stars are phoenixes, rising from their own ashes.
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Our ancestors lived out of doors. They were as familiar with the night sky as most of us are with our favorite television programs.
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If we continue to accumulate only power and not wisdom, we will surely destroy ourselves.
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We make our world significant by the courage of our questions and the depth of our answers.
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Every star may be a sun to someone.
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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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There are as many atoms in one molecule of DNA as there are stars in a typical galaxy.
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We can judge our progress by the courage of our questions and the depth of our answers, our willingness to embrace what is true rather than what feels good.
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Every kid starts out as a natural-born scientist, and then we beat it out of them. A few trickle through the system with their wonder and enthusiasm for science intact.
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I’ve always thought an agnostic is an atheist without the courage of his convictions.
CARL SAGAN