Except in pure mathematics, nothing is known for certain (although much is certainly false).
CARL SAGANScience is a way to not fool ourselves.
More Carl Sagan Quotes
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We are like butterflies who flutter for a day and think it is forever.
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Other things being equal, it is better to be smart than to be stupid.
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The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.
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Human beings have a demonstrated talent for self-deception when their emotions are stirred.
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The cure for a fallacious argument is a better argument, not the suppression of ideas.
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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.
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For me, it is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring.
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All over the world there are enormous numbers of smart, even gifted, people who harbor a passion for science.
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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.
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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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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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If we ruin the earth, there is no place else to go.
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Don’t judge everyone else by your own limited experience.
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Science is a way to not fool ourselves.
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I’ve always thought an agnostic is an atheist without the courage of his convictions.
CARL SAGAN