“It doesn’t matter whether you win or lose—until you lose”

Entry in progress—B.P.
 
20 February 1977, Dallas (TX) Morning News, “County political parties positioning for future battles” by Dotty Griffith, pg. 37A, col. 5:
Getting away from traditional Republican hassles and winning elections is perhaps best exemplified by the poster which hangs in Mrs. Judy’s office. It reads, “It doesn’t matter if you win or lose…until you lose.”
   
Google Books
Quaker Life
Volume 19
1978
Pg. 21:
Charles Schulz in the Peanuts cartoon puts it this way: “It doesn’t matter if you win or lose…until you lose.”
 
Google News Archive
8 December 1981, Cavalier Daily (University of Virginia, Charlottesville), “Athletics: Schultz Says Campaign Will Help But Not Much ” by Larry Appel, pg. 3, col. 1:
A Snoopy poster hangs on one of the walls of Virginia Athletic Director Dick Schultz’s office. According to Snoopy, “It doesn’t matter if you win or lose…until you lose.”
 
Google Books
Calming the Storm:
Letting God Help You in Times of Crisis
By Charles William Stewart
Nashville, TN: Abingdon Press
1988
Pg. 14:
A current bumper sticker reads, “It matters not whether you win or lose, until you lose.”

Google Books
The Weapons of Your Warfare:
Equipping Yourself to Defeat the Enemy
By Larry Lea
Altamonte Springs, FL: Creation House
1989
Pg .22:
I like what Snoopy said in one of the Peanuts cartoons by Charles Schultz: “It doesn’t matter whether you win or lose — until you lose.”