“You can't prove that something doesn't exist. You can only prove that something does exist.”
Source: The Gates
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John Connolly 23
author 1968Related quotes

“In principio it is impossible to prove from experiments that something is non-existent.”
The Magnetic Current http://adsabs.harvard.edu/abs/1941Sci....94..232E, Science, Volume 94, Issue 2436, pp. 232-233 (September, 1941)

God doesn't believe in atheists (2002)

On Guard: Defending Your Faith with Reason and Precision (2010), p. 149
“Prove to me that you have the right to exist!”
Source: The Soul of Liberty (1980), p. 5.

Simon O'Hagan "Credo:Peter Blake", http://www.findarticles.com/p/articles/mi_qn4159/is_20051120/ai_n15851377 The Independent on Sunday, 2005-11-20. Accessed from findarticles.com, 2007-01-22
Life

“I show you doubt, to prove that faith exists.”

Creation seminars (2003-2005), Lies in the textbooks

The Paris Review interview (1984)
Context: I let characters and symbols emerge from me, as if I were dreaming. I always use what remains of my dreams of the night before. Dreams are reality at its most profound, and what you invent is truth because invention, by its nature, can’t be a lie. Writers who try to prove something are unattractive to me, because there is nothing to prove and everything to imagine. So I let words and images emerge from within. If you do that, you might prove something in the process.