Entry in progress—B.P.
 
Monticello.org (Thomas Jefferson)—Spurious Quotations
Quotation: “Peace is that brief glorious moment in history when everybody stands around reloading.”
(...)
First known appearance in print: 1973
First known attribution to Jefferson in print: We have found no attributions of this quotation to Thomas Jefferson in print.  It has been attributed to him on various sites on the Internet (particularly discussion boards) since at least 2001.
Comments: This quotation has not been found in the writings of Thomas Jefferson.  The language is somewhat uncharacteristic of Jefferson’s style.  “Stand around” in the sense used here is not an expression that can be found in Jefferson’s letters.  He almost always wrote “every body” instead of “everybody.”  And there are no instances of the word “reload” (or variations thereof) referring to firearms in Jefferson’s writings.
- Anna Berkes, 9/17/12
 
Google Books
Meetings and Conventions
Volume 8
1973
Pg. 64:
Peace is that brief glorious moment in history when everybody stands around reloading.
 
Google Books
Quote Unquote
By Lloyd Cory
Wheaton, IL: Victor Books
1977
Pg. 232:
Peace is that brief glorious moment in history when everybody stands around reloading.