"Most dangerous man in the world" quote

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Just today:
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I'm looking for the correct quotation for this paraphrased  quote:

"The most dangerous man in the world is the man who is absolutely  sure
that he is right."

This isn't the correct quote, but does give  the sense of quotation.
I'd like to have the correct quotation, and where it  came from.

Thanks,
J.
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(GOOGLE)
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_The Cult - Scene Dissections_
(http://chuckpalahniuk.net/community/showthread.php?mode=hybrid&t=11683)
... _____. "The most dangerous man is the  one who knows he is right." -
Someone, probably Frank  Herbert. Reply With Quote. ...
chuckpalahniuk.net/community/  showthread.php?mode=hybrid&t=11683 - 67k -
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(PROQUEST HISTORICAL NEWSPAPERS)
_SCHOOLS  HELD LAX IN FIGHTING CRIME; Copeland Urges Revision of System to
Stress  'Attitudes' Instead of 'Aptitudes.' ONE ROAD TO PREVENTION He Tells
Lions Group  America Must Rely on Public Classes to Solve Problem. _
(http://proquest.umi.com/pqdweb?index=0&did=87963093&SrchMode=1&sid=2&Fmt=10&VInst=PROD&VTyp
e=PQD&RQT=309&VName=HNP&TS=1107243254&clientId=65882)
New York Times (1857-Current file). New York, N.Y.: Jul 21,  1936. p. 15 (1
page)
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"The most dangerous man in the world is the highly educated man without
character."
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_Those  Little Things Mean a Lot_
(http://proquest.umi.com/pqdweb?index=2&did=475909872&SrchMode=1&sid=3&Fmt=10&VInst=PROD&VType=PQD&RQT=309&VName=HNP&TS=11
07243736&clientId=65882)
Los Angeles Times (1886-Current  File). Los Angeles, Calif.: Jul 20, 1958. p.
D3 (1 page)
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"The most dangerous man in the world is a second lieutenant with a  map."
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