Except in pure mathematics, nothing is known for certain (although much is certainly false).
CARL SAGANEvery one of us is, in the cosmic perspective, precious. If a human disagrees with you, let him live. In a hundred billion galaxies, you will not find another.
More Carl Sagan Quotes
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An atheist is someone who is certain that God does not exist, someone who has compelling evidence against the existence of God.
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Extraordinary claims require extraordinary evidence.
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Any faith that admires truth, that strives to know God, must be brave enough to accommodate the universe.
CARL SAGAN -
Science is not only compatible with spirituality; it is a profound source of spirituality.
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Those at too great a distance may, I am well are, mistake ignorance for perspective.
CARL SAGAN -
Our ancestors lived out of doors. They were as familiar with the night sky as most of us are with our favorite television programs.
CARL SAGAN -
If it can be destroyed by the truth, it deserves to be destroyed by the truth.
CARL SAGAN -
The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.
CARL SAGAN -
Every one of us is, in the cosmic perspective, precious. If a human disagrees with you, let him live. In a hundred billion galaxies, you will not find another.
CARL SAGAN -
Not all birds can fly. What separates the flyers from the walkers is the ability to take off.
CARL SAGAN -
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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The beauty of a living thing is not the atoms that go into it, but the way those atoms are put together.
CARL SAGAN -
We are a way for the cosmos to know itself.
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Arguments from authority carry little weight, authorities have made mistakes in the past. They will do so again in the future. Perhaps a better way to say it is that in science there are no authorities; at most, there are experts.
CARL SAGAN -
Avoidable human misery is more often caused not so much by stupidity as by ignorance, particularly our ignorance about ourselves.
CARL SAGAN







