From: "John Beamish" 

Our former PM mused on what a proof is.

http://www.brainyquote.com/quotes/authors/j/jean_chretien.html
Even better, here's an audio of it (ignore the preamble/postamble)


On Fri, 13 Apr 2007 02:22:24 -0400, Ad
 wrote:

> Robert Comer wrote:
>> Nope, those are actually positive proof.  Negative proof is proof by
>> the absence of proof, and is invalid.
>>
>
> the absence of proof is not proof of absence.
>
>
> Adam

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