“I have never been a quitter.”
Resignation Address to the Union (8 August 1974)
1970s
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Richard Nixon 89
37th President of the United States of America 1913–1994Related quotes

“A quitter never wins-and-a winner never quits.”
Variant: A quitter never wins and a winner never quits.
Source: Think and Grow Rich: The Landmark Bestseller - Now Revised and Updated for the 21st Century

“You can never quit. Winners never quit, and quitters never win.”

“I am a fighter and not a quitter!”
Jason Beattie, Jon Hibbs, "Triumphant Mandelson hails new Labour victory", Scotsman, 8 June 2001, p. 5.
Acceptance speech after re-election as MP for Hartlepool in the 2001 General Election.
Context: Before this campaign started, it was said that I was facing political oblivion, my career in tatters, apparently never to be part of political life again. Well they underestimated Hartlepool and they underestimated me, because I am a fighter and not a quitter!My political opponents can have their pound of flesh, and they do, but they will not eat into of my beliefs, what I stand for and have done in politics. That is the inner steel in me.

“Talent is a wonderful thing, but it won't carry a quitter.”
Source: Duma Key

“We had quitters during the Revolution too… we called them "Kentuckians."”
This attribution apparently originated with a statement of a cartoon version of Washington on an episode http://www.imdb.com/title/tt0701155/quotes of The Simpsons. Though not initially presented as a genuine quote this has sometimes been attributed to Washington.
Misattributed, Spurious attributions

Jason Beattie, Jon Hibbs, "Triumphant Mandelson hails new Labour victory", Scotsman, 8 June 2001, p. 5.
Acceptance speech after re-election as MP for Hartlepool in the 2001 General Election.

“Unjust I may have been, weak and resentful I have been, but never inconstant.”
Source: Persuasion

“Things have never been so swell
and I have never felt this well! I have never failed to feel… Pain!”
You Know You're Right.
Song lyrics, Posthumously released (post-1994)

“Emphatically no, and I never have been.”
Peter Howard, "Men on Trial" (Blandford Press, 1945), p. 69
Asked by Peter Howard whether he favoured the use of any measure of force to establish Socialism.