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Not all birds can fly. What separates the flyers from the walkers is the ability to take off.

Carl Sagan

Don’t judge everyone else by your own limited experience.
CARL SAGAN

Experience Judgement Life Limitation
The universe is a pretty big place. If it’s just us, seems like an awful waste of space.
CARL SAGAN

Awful Place Pretty Science Space Universe Waste
You have to know the past to understand the present.
CARL SAGAN

Deep Inspirational One Liner Past Present Understand
Books are like seeds. They can lie dormant for centuries and then flower in the most unpromising soil.
CARL SAGAN

Book Century Flower Lie Promise Seed Soil
Books break the shackles of time, proof that humans can work magic.
CARL SAGAN

Book Break Human Magic Proof Time Work
If I finish a book a week, I will read only a few thousand books in my lifetime, about a tenth of a percent of the contents of the greatest libraries of our time. The trick is to know which books to read.
CARL SAGAN

Book Content Finish Library Lifetime Percent Reading Time Trick Week
Not explaining science seems to me perverse. When you’re in love, you want to tell the world.
CARL SAGAN

Explanation Love Peverse Science Want World
The Earth is the only world known so far to harbor life.
CARL SAGAN

Earth Harbor Life
One of the greatest gifts adults can give – to their offspring and to their society – is to read to children.
CARL SAGAN

Adult Children Gift Reading Society Spring
We make our world significant by the courage of our questions and the depth of our answers.
CARL SAGAN

Courage Depth Significance World
Except in pure mathematics, nothing is known for certain (although much is certainly false).
CARL SAGAN

Certain Except False Mathematics Pure
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

Cosmic Disagree Finding Galaxy Human Love Mercy Perspective Precious
Nature is always more subtle, more intricate, more elegant than what we are able to imagine.
CARL SAGAN

Elegant Imagination Nature Stuble
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
There are no forbidden questions in science, no matters too sensitive or delicate to be probed, no sacred truths.
CARL SAGAN

Delicate Forbidden Matter Scare Science Sensitive Truth
I’ve always thought an agnostic is an atheist without the courage of his convictions.
CARL SAGAN

Atheist Conviction Courage

Not all birds can fly. What separates the flyers from the walkers is the ability to take off.

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Not all birds can fly. What separates the flyers from the walkers is the ability to take off.

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