“You never really learn to swear until you learn to drive”

“You never really learn to swear until you learn to drive” is a jocular saying that has been printed on many gift items, such as T-shirts, bumper stickers and posters. “And then comes the wonderous (sic) day when you get your own license and you learn to swear on your own” was cited in print in 1977. “You never really learn to swear until you learn to drive” appears to have been cited in print in 1987. (The Google Books date may be incorrect.)
 
“GRANDPA CHARNOCK’S LAW: You never really learn to swear until you learn to drive” was cited in The Complete Murphy’s Law (1990) by Arthur Bloch.
   
   
23 February 1977, Hyde Park (IL) Herald, “An Open Letter to Superintendent of Police James M. Rochford,” pg. 2, col. 1:
All the “Officer Friendly” meetings in school cannot possibly overcome what one learns while riding the streets as a child. And then comes the wonderous (sic) day when you get your own license and you learn to swear on your own.
 
18 September 1977, Cedar Rapids (IA) Gazette, “Ford Wins Name Game” by Ford Clark, pg. 4D, col. 4:
As every feminist knows, the first thing you have to learn is to swear like a truck driver.
   
Google Books 
Four Quarters
Front Cover
Faculty of La Salle College
1987
Pg. 50:
You never really learn to swear until you learn to drive.
 
Google Books
The Complete Murphy’s Law:
A Definitive Collection
By Arthur Bloch
Los Angeles, CA: Price Stern Sloan
1990
Pg. 201:
GRANDPA CHARNOCK’S LAW: You never really learn to swear until you learn to drive.
 
Google Books
The Art and Practice of Loving
By Frank Andrews, Ph.D.
Los Angeles, CA: Jeremy P. Tarcher
1990
Pg. 63:
You never really learn to swear until you learn to drive.
ANONYMOUS (QUOTED BY ARTHUR BLOCH)
 
Google Books
Planet Internet
By Steve Rimmer
Blue Ridge Summit, PA: Windcrest/McGraw-Hill
1994
Pg. ?:
You never really learn to swear until you learn to drive.
 
Google News Archive
27 January 1998, The Dispatch (Lexington, NC), “Trivia” by L. M. Boyd, pg. 4B, col. 3:
Add Uncredited ‘Net Lines: “You never really learn to swear until you learn to drive.”
 
Google Books
Tweet This Book:
The 1,400 Greatest Quotes of All Time in 140 Characters Or Less
By Sayre Van Young and Marin Van Young
Berkeley, CA: Ulysses Press
2011
Pg. ?:
You never really learn to swear until you learn to drive.
Anonymous