Except in pure mathematics, nothing is known for certain (although much is certainly false).
CARL SAGANThere are as many atoms in one molecule of DNA as there are stars in a typical galaxy.
More Carl Sagan Quotes
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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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Understanding is a kind of ecstasy.
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Stars are phoenixes, rising from their own ashes.
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Writing is the greatest of human inventions, binding together people, citizens of distant epochs, who never knew one another.
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Books are like seeds. They can lie dormant for centuries and then flower in the most unpromising soil.
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We can’t help it. Life looks for life.
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For small creatures such as we the vastness is bearable only through love.
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If we continue to accumulate only power and not wisdom, we will surely destroy ourselves.
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And you are made of a hundred trillion cells. We are, each of us, a multitude.
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Science is a way of thinking much more than it is a body of knowledge.
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Somewhere, something incredible is waiting to be known.
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Imagination will often carry us to worlds that never were, but without it we go nowhere.
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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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Your god is too small for my universe.
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People are not stupid. They believe things for reasons.
CARL SAGAN