“This is how deep truths are winnowed from deep nonsense.”
Source: The Demon-Haunted World : Science as a Candle in the Dark (1995), Ch. 17 : The Marriage of Skepticism and Wonder
Context: At the heart of science is an essential balance between two seemingly contradictory attitudes - an openness to new ideas, no matter how bizarre or counterintuitive, and the most ruthlessly skeptical scrutiny of all ideas, old and new. This is how deep truths are winnowed from deep nonsense. The collective enterprise of creative thinking and skeptical thinking, working together, keeps the field on track. Those two seemingly contradictory attitudes are, though, in some tension.
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Carl Sagan 365
American astrophysicist, cosmologist, author and science ed… 1934–1996Related quotes

A comment on "Mind Control and Me" at LessWrong.com (March 2009) http://lesswrong.com/lw/46/mind_control_and_me/319?context=1
"Mirror, Mirror on the Wall, I Don't Want to Hear One Word Out of You"
The Snake Has All the Lines (1960)

“God's truth and faithfulness "are a great deep."”
They resemble the ocean itself; always there — vast, fathomless, sublime, the same in its majesty, its inexhaustible fullness, yesterday, to-day, and forever; the same in calm and storm, by day and by night; changeless while generations come and pass; everlasting while ages are rolling away.
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 261.

“Verily we know nothing. Truth is buried deep.”
Another translation: "Of truth we know nothing, for truth is in a well." Diogenes Laertius, Lives of Eminent Philosophers R.D. Hicks, Ed. http://www.perseus.tufts.edu/hopper/text?doc=Perseus:abo:tlg,0004,001:9:11
Source Book in Ancient Philosophy (1907), The Fragments

“Mystical explanations are considered deep; the truth is, they are not even shallow.”
Sec. 126; variant translation: Mystical explanations are thought to be deep; the truth is that they are not even shallow.
The Gay Science (1882)