Here's the Story on Duncan's Quote:

My Letter to Inspire
(This will give you all the background info.)
Michael Bledsoe's Reply
(Michael Bledsoe, the brother of former NFL quarterback Drew Bledsoe, runs the Inspire quote service.)
The Pre-Publish Announcement
(This message from John Brotherton confirmed the publication date of Duncan's quote.)
The Published Inspire Message
(This is Duncan's quote, as it appeard in the email sent out by the Inspire quote service, Circulation 23,500)