“Absence of proof is not proof of absence.”
Source: The Lost World
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Michael Crichton 121
American author, screenwriter, film producer 1942–2008Related quotes

As quoted in “Don Pañong – Genius" by A.V.H. Hartendorp in Philippine Magazine (September 1929), p. 211.
ULOL

“Absence of evidence is not evidence of absence.”
Martin Rees — Sagan refers to this quote in The Demon-Haunted World (1995) (see above)
Misattributed
Source: Cosmos

“Absence of evidence is not evidence of absence.”
As quoted in Project Cyclops: A Design Study of a System for Detecting Extraterrestrial Intelligent Life (1971) http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19730010095_1973010095.pdf by Bernard M. Oliver, and John Billingham, Ch. 2 : Life in the Universe, p. 3 ; this has frequently misattributed to Carl Sagan, who quoted it in some of his presentations.
“Loneliness Is Not The Absence Of Affection, But The Absence Of Direction.”

“Discouragement is not the absence of adequacy but the absence of courage.”

“Silence is not the absence of sound, but the absence of self.”
Emptiness
One Minute Wisdom (1989)
“But the absence of tears wasn't the same as an absence of feeling.”
Source: Mine Till Midnight

“The absence of hatred in no way implies the absence of moral indignation.”
January 1943, p. 590
Etty: The Letters and Diaries of Etty Hillesum, 1941-1943