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There are no forbidden questions in science, no matters too sensitive or delicate to be probed, no sacred truths.

Carl Sagan

The truth may be puzzling. It may take some work to grapple with. It may be counterintuitive. It may contradict deeply held prejudices. It may not be consonant with what we desperately want to be true. But our preferences do not determine what’s true.
CARL SAGAN

desperatel Determination Preference Prejudice Puzzle True Truth Want Work
Books permit us to voyage through time, to tap the wisdom of our ancestors.
CARL SAGAN

Book Permit Time Voyage Wisdom
Nothing disturbs me more than the glorification of stupidity.
CARL SAGAN

Disturb Glory Stupidity
There are as many atoms in one molecule of DNA as there are stars in a typical galaxy.
CARL SAGAN

Atom DNA Galaxy Molecule Science Stars Typical
I’ve always thought an agnostic is an atheist without the courage of his convictions.
CARL SAGAN

Atheist Conviction Courage
The absence of evidence is not evidence of absence.
CARL SAGAN

Absence Evidence One Liner
The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.
CARL SAGAN

Brain Feeling Goodness Joy Muscle Understand
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

Argument Authority Expert Future Mistake Past Weight
We are star stuff harvesting sunlight.
CARL SAGAN

Harvest Stars Stuff Sunlight
There are as many atoms in one molecule of DNA as there are stars in a typical galaxy.
CARL SAGAN

Atom DNA Galaxy Molecule Science Stars Typical
The Earth is the only world known so far to harbor life.
CARL SAGAN

Earth Harbor Life
Nature is always more subtle, more intricate, more elegant than what we are able to imagine.
CARL SAGAN

Elegant Imagination Nature Stuble
People are not stupid. They believe things for reasons.
CARL SAGAN

Believe Deep People Reason Stupidity
An atheist is someone who is certain that God does not exist, someone who has compelling evidence against the existence of God.
CARL SAGAN

Against Atheist Certain Evidence Existence God
I think the health of our civilization, the depth of our awareness about the underpinnings of our culture and our concern for the future can all be tested by how well we support our libraries.
CARL SAGAN

Awareness Book Civilization Concern Culture Depth Future Health Library Test
A galaxy is composed of gas and dust and stars – billions upon billions of stars. Every star may be a sun to someone.
CARL SAGAN

Compose Dust Galaxy Gas Stars Sun

There are no forbidden questions in science, no matters too sensitive or delicate to be probed, no sacred truths.

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There are no forbidden questions in science, no matters too sensitive or delicate to be probed, no sacred truths.

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Popular Authors

More Carl Sagan Quotes