What counts is not what sounds plausible, not what we would like to believe, not what one or two witnesses claim, but only what is supported by hard evidence rigorously and skeptically examined. Extraordinary claims require extraordinary evidence.
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1 min 10 secCarl Sagan
Forgotten were the elementary rules of logic, that extraordinary claims require extraordinary evidence and that what can be asserted without evidence can also be dismissed without evidence.
Christopher Hitchens
For all I know we may be visited by a different extraterrestrial civilization every second Tuesday, but there's no support for this appealing idea. The extraordinary claims are not supported by extraordinary evidence.
Carl Sagan
There are extraordinary situations which require extraordinary interposition. An exasperated people, who feel that they possess power, are not easily restrained within limits strictly regular.
Thomas Jefferson
That general warrants, whereby an officer or messenger may be commanded to search suspected places without evidence of a fact committed, or to seize any person or persons not named, or whose offence is not particularly described and supported by evidence, are grievous and oppressive, and ought not to be granted.
George Mason
Exceptional claims require exceptional evidence.
Christopher Hitchens
Sagan, Carl
Sagan, Francoise
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