An atheist is someone who is certain that God does not exist, someone who has compelling evidence against the existence of God. I know of no such compelling evidence. Because God can be relegated to inaccessible times and places, and because he can be endowed with all sorts of powers and properties, I do not see how his non-existence can be demonstrated.
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"For small creatures such as we the vastness is bearable only through love."
"Who are we? We are a collection of water and a few fundamental chemicals, but we are also a way for the universe to know itself."
"The greatest joy of all is to understand. The greatest reward is to understand."
"The price of skepticism is that you are occasionally fooled. The price of credulity is that you are often fooled."
"Somewhere, something incredible is waiting to be known."
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Sagan draws a precise line: an atheist requires compelling evidence that God doesn't exist, which he argues is impossible to obtain. Because God can be defined as existing beyond any testable realm—outside observable time and space, with unlimited attributes—no scientific investigation can rule him out. Sagan isn't defending religion; he's applying rigorous logic: you cannot falsify an unfalsifiable claim, so certainty of God's nonexistence is scientifically unjustifiable.
Sagan openly identified as agnostic throughout his career, a position this quote precisely captures. His work in astronomy and astrophysics trained him to demand evidence before accepting any claim, but also to acknowledge what evidence cannot prove. His Cosmos series and The Demon-Haunted World explored the boundary between science and faith without dismissing wonder. He found meaning in the universe itself rather than through organized religion or hard denial of the divine.
In the 1970s–90s, when Sagan was most prominent, American culture navigated rising religious conservatism—the Moral Majority, Reagan-era culture wars—alongside landmark science: Voyager flybys, early SETI searches, expanding cosmological models. New Atheism as a movement hadn't crystallized yet. Sagan occupied a culturally important middle ground, defending science against creationism and pseudoscience while refusing atheism's dogmatic certainty, making his nuanced agnosticism both intellectually rigorous and strategically influential in public discourse.
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