“Do it tomorrow. You’ve made enough mistakes (for) today” is a saying that has been printed on many images.
       
“Mrs. Harper Richards is bemused by the motto: ‘Do it tomorrow—you’ve made enough mistakes today’” was printed in the Chicago (IL) Sunday Tribune on May 20, 1956. “And I thoroughly agree with a sign Paul Wentz of Sherman Oaks saw in a San Fernando Valley restaurant: ‘Do It Tomorrow—You’ve Made Enough Mistakes Today!’” was printed in the Los Angeles (CA) Times on June 4, 1956. “Defense Secretary Charles E. Wilson has a sign on his desk reading: ‘Do it tomorrow—You’ve made enough mistakes today’” was printed in The Washington Post and Times Herald (Washington, DC) on June 4, 1956.
     
“SIGNS FOR SOMEBODY’S OFFICE WALL: ‘Do It Tomorrow. You’ve Made Enough Mistakes for Today’” was printed in the Atlantic Coast Line News in 1958. “Do it tomorrow - you’ve made enough mistakes for today!” was posted on the newsgroup rec.music.makers.saxophone on June 8, 1997. “Do it tomorrow. You’ve made enough mistakes for today” was printed in the book Blonde Walks into a Bar: The 4,000 Most Hilarious, Gut-Busting Gags, One-liners and Jokes (2008) by Jonathan Swan.
   
   
Newspapers.com
20 May 1956, Chicago (IL) Sunday Tribune, “Have you heard?” by Kathryn Loring, pt. 7, pg. 6, col. 2:
Mrs. Harper Richards is bemused by the motto: “Do it tomorrow—you’ve made enough mistakes today.”
   
Newspapers.com
4 June 1956, Los Angeles (CA) Times, “Ham on Ryon” by Art Ryon, pg. II, pg. 5, col. 1:
And I thoroughly agree with a sign Paul Wentz of Sherman Oaks saw in a San Fernando Valley restaurant: “Do It Tomorrow—You’ve Made Enough Mistakes Today!”
 
4 June 1956, The Washington Post and Times Herald (Washington, DC), “Post Scripts,” pg. 2, col. 3:
Defense Secretary Charles E. Wilson has a sign on his desk reading: “Do it tomorrow—You’ve made enough mistakes today.”
 
Newspapers.com
6 June 1956, Springfield (MO) Leader-Press, “Tabloid Topics” by the United Press, pg. 13, col. 1:
WASHINGTON—On Defense Secretary Charles E. Wilson’s desk is a card bearing this admonition: “Do it tomorrow—you’ve made enough mistakes today.”
     
Google Books
Atlantic Coast Line News
Volumes 39-40
1958
Pg. 17:
SIGNS FOR SOMEBODY’S OFFICE WALL:
“Do It Tomorrow. You’ve Made Enough Mistakes for Today.”
   
Google Books
1800 Quips and Illustrations for All Occasions
By Herbert V. Prochnow
Grand Rapids, MI: Baker Books
1994 (Originally printed in 1969.)
Pg. 283:
Do it tomorrow - you’ve made enough mistakes today.
 
Google Groups: rec.music.makers.saxophone
Where is the best place to buy vintage saxophones?   
Eric Dannewitz
Jun 8, 1997, 3:00:00 AM
(...)
“Do it tomorrow - you’ve made enough mistakes for today!”
   
Google Groups: fido7.ru.english
ÓÍÅÛÎÙÅ ÆpÁÚÙ
Nastya Rovovaya
Oct 21, 1998, 3:00:00 AM
(...)
Do it tomorrow - you’ve made enough mistakes for today.
 
Google Books
Blonde Walks into a Bar:
The 4,000 Most Hilarious, Gut-Busting Gags, One-liners and Jokes
By Jonathan Swan
Berkeley, CA: Ulysses Press
2008
Pg. ?:
Do it tomorrow. You’ve made enough mistakes for today.
   
Twitter
Edgar Jabas
@jabasearch
Do it tomorrow - you’ve made enough mistakes for today.. http://www.ejabas.com
8:46 AM · Jun 30, 2009
     
Twitter
Pratt Falls🪩
@PrattFalls
Found hanging above the copy machine, our new office motto: Do it tomorrow. You’ve made enough mistakes today.
12:09 PM · Jul 31, 2009
   
Twitter
jenahurd
@jenahurd
Do it tomorrow - you’ve made enough mistakes today
12:24 PM · Sep 1, 2009
 
Twitter
Haroon Riaz
@HaroonRiaz
RT @funnyoneliners: Do it tomorrow.
You’ve made enough mistakes for today.
4:24 PM · Jun 8, 2010
 
Twitter
toby allred
@tobyntx
Do it tomorrow. You’ve made enough mistakes for today.-Toby Allred
8:50 PM · Oct 13, 2019
   
Twitter
On The Rocks
@MusicallyYours0
Do it tomorrow, you’ve made enough mistakes for today.
#ThursdayMotivation
11:05 AM · Nov 14, 2019
   
Twitter
Porcelain Destroyer
@localasshole1
Do it tomorrow. You’ve made enough mistakes for today.
9:46 AM · May 13, 2020
 
Facebook 
More Crazy Stuff
May 24, 2023 at 5:59   ·
(The following text is shown on an image.—ed.)
Do it tomorrow
You’ve made enough
mistakes for today