“A true friend is one who overlooks your failures and tolerates your success” is a friendship saying that has been printed on many images. “A true friend is one who willingly overlooks your failures and tolerates your successes” was written by American columnist Doug Larson (1926-2017) in the Green Bay (WI) Press-Gazette on December 25, 1993. “A friend is a person who overlooks your failures and tolerates your triumphs” was written by Larson in the Green Bay (WI) Press-Gazette on July 3, 1999.
   
The word “willingly” is usually dropped, and “successes” is often written as “success.” “A true friend is one who overlooks your failures and tolerates your successes. — DOUG LARSON” was printed in the book Reader’s Digest Quotable Quotes (1997). “A true friend is one who overlooks your failures and tolerates your success. Doug Larson” was posted on Twitter by Chris Zeller on May 18, 2008.
         
                 
Wikipedia: Doug Larson
Doug Larson (February 10, 1926 to April 1, 2017) was a columnist and editor for the Door County Advocate (1953–1964) and wrote a daily column, “Doug’s Dugout,” for the Green Bay Press-Gazette (1964–1988), both Wisconsin-based newspapers. The column was originally syndicated through United Media under the title “Senator Soaper Says”; Larson took over authorship in 1980. Previously, it had been written by Bill Vaughn of the Kansas City Star. Larson was born in Sturgeon Bay, Wisconsin.
     
25 December 1993, Green Bay (WI) Press-Gazette, Doug Larson column, pg. A-13, col. 1: 
A true friend is one who willingly overlooks your failures and tolerates your successes.
 
20 May 1994, St. Louis (MO) Post-Dispatch, ‘Senator Soaper,” pg. 15E, col. 1:
A true friend is one who willingly overlooks your failures and tolerates your successes.
   
Google Books
Reader’s Digest Quotable Quotes:
Wit and wisdom for all occasions from America’s most popular magazine
By Reader’s Digest Association
Pleasantville, NY: Reader’s Digest
1997  
Pg. 37:
A true friend is one who overlooks your failures and tolerates your successes. — DOUG LARSON
 
3 July 1999, Green Bay (WI) Press-Gazette, Doug Larson column, pg. D-2, col. 6:
A friend is a person who overlooks your failures and tolerates your triumphs.
 
Twitter
Chris Zeller
@chriszeller
A true friend is one who overlooks your failures and tolerates your success. Doug Larson
10:55 PM - 18 May 2008
     
6 November 2009, The Salinas Californian (Salinas, CA), “The Aces on Bridge” by Bobby Wolff, pg. 3B, col. 5:
“A true friend is one who overlooks your failures and tolerates your success.”—Doug Larson
 
Google Books
Quoting: Friendship
By iMinds
iMinds Pty Ltd.
2009
Pg. ?: 
“A true friend is one who overlooks your failures and tolerates your successes.” - Doug Larson
 
Google Books
An Actor Succeeds:
Tips, Secrets & Advice on Auditioning, Connection, Coping, and Thriving in and out of Hollywood, from Stars, Agents, Coaches, Casting Directors, Producers, and Others
By Boze Hadleigh
Milwaukee, WI: Applause Theatre & Cinema Books
2014
Pg. ?:
“Verily, the best friend a performer can have is someone who overlooks your failures and tolerates your successes.” —ROSIE O’DONNELL
 
Twitter
Brian Tops
@BrianJBrogan
“A true friend is one who overlooks your failures and tolerates your success!”—Doug Larson
#igreads
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10:18 PM - 3 May 2019