Quotes about stop
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Source: Your Best Life Now: 7 Steps to Living at Your Full Potential

“stop fixing your bodies and start fixing the world!”

The William Saroyan Reader (1958)
Context: The writer is a spiritual anarchist, as in the depth of his soul every man is. He is discontented with everything and everybody. The writer is everybody's best friend and only true enemy — the good and great enemy. He neither walks with the multitude nor cheers with them. The writer who is a writer is a rebel who never stops.
Source: Captivating: Unveiling the Mystery of a Woman's Soul

When the Leaves Blow Away (2006), I Still Have a Pony (2007)

“The most important thing to do if you find yourself in a hole is to stop digging.”

“If you want something new, you have to stop doing something old”

“So you're gonna end this by dying, huh? Stop running away!”

“The important thing is not to stop questioning.”
Old Man's Advice to Youth: "Never Lose a Holy Curiosity," http://books.google.com/books?id=dlYEAAAAMBAJ&lpg=PP1&dq=Life%2C%202%20May%201955&pg=PA61#v=onepage&q=Life,%202%20May%201955&f=false LIFE magazine (2 May 1955) statement to William Miller, p. 64.
1950s
Context: The important thing is not to stop questioning. Curiosity has its own reason for existence. One cannot help but be in awe when he contemplates the mysteries of eternity, of life, of the marvelous structure of reality. It is enough if one tries merely to comprehend a little of this mystery each day. Never lose a holy curiosity. … Don't stop to marvel.

“Go so far away that you stop being afraid of not coming back.”
Source: I am an Emotional Creature

Galen, On the Natural Faculties, Bk. 1, sect. 13; cited from Arthur John Brock (trans.) On the Natural Faculties (London: Heinemann, 1963) p. 57.

Source: Cesar's Way: The Natural, Everyday Guide to Understanding and Correcting Common Dog Problems

Remarks at the Annual Salute to Congress Dinner http://www.reagan.utexas.edu/archives/speeches/1981/20481b.htm (4 February 1981)
1980s, First term of office (1981–1985)
Variant: Thomas Jefferson once said, "We should never judge a president by his age, only by his works." And ever since he told me that I stopped worrying.
Context: Thomas Jefferson made a comment about the Presidency and age. He said that one should not worry about one's exact chronological age in reference to his ability to perform one's task. And ever since he told me that, I stopped worrying.

“Never let the things you can't do, stop you from doing what you can.”

“Stop wearing your wishbone where your backbone ought to be.”
This derives from a folk proverb sometimes attributed to Clementine Paddleford, but in use as an "old proverb" as early as 1908, when Paddeford was only 10 years old.
Misattributed
Source: Eat, Pray, Love

Source: Secrets of the Millionaire Mind: Mastering the Inner Game of Wealth

“I don’t stop when I’m tired. I only stop when I’m done…”

A Poet's Advice (1958)
Context: Almost anybody can learn to think or believe or know, but not a single human being can be taught to feel …
the moment you feel, you're nobody-but-yourself.
To be nobody-but-yourself — in a world which is doing its best, night and day, to make you everybody else — means to fight the hardest battle which any human being can fight; and never stop fighting.

“You, yes, you, linger inside my heart
The same you who stopped us before we could start.”
Source: Second Helpings

“You don't stop loving someone just because you hate them.”
Source: Intimacy

“When I stop working the rest of the day is posthumous. I'm only really alive when I'm writing.”

“We must find time to stop and thank the people who make a difference in our lives.”

“But, said Alice, if the world has absolutely no sense, who's stopping us from inventing one?”

“Something must be wrong with me to stop a good girl-on-girl fight”

J'accuse! (1898)
Context: These military tribunals have, decidedly, a most singular idea of justice.
This is the plain truth, Mr. President, and it is terrifying. It will leave an indelible stain on your presidency. I realise that you have no power over this case, that you are limited by the Constitution and your entourage. You have, nonetheless, your duty as a man, which you will recognise and fulfill. As for myself, I have not despaired in the least, of the triumph of right. I repeat with the most vehement conviction: truth is on the march, and nothing will stop it. Today is only the beginning, for it is only today that the positions have become clear: on one side, those who are guilty, who do not want the light to shine forth, on the other, those who seek justice and who will give their lives to attain it. I said it before and I repeat it now: when truth is buried underground, it grows and it builds up so much force that the day it explodes it blasts everything with it. We shall see whether we have been setting ourselves up for the most resounding of disasters, yet to come.

Source: Practicing the Power of Now: Essential Teachings, Meditations, and Exercises from the Power of Now

“Go on till you come to the end; then stop.”
Source: Alice's Adventures in Wonderland & Through the Looking-Glass

Source: On the Heights of Despair (1934)
Source: The Hidden Messages in Water

“The only guarantee for failure is to stop trying”

“Could it think, the heart would stop beating.”
O coração, se pudesse pensar, pararia.
Source: The Book of Disquietude ["Livro do Desassossego"], by Bernardo Soares (Pessoa's semi-heteronym), translated by Richard Zenith (1996), text 1

“To stop the flow of music would be like the stopping of time itself, incredible and inconceivable.”

“The worst kind of pain is when you're smiling just to stop the tears from falling.”
Schjeldahl, Peter. "Looking Back: Diane Arbus at the Met" http://www.newyorker.com/archive/2005/03/21/050321craw_artworld?currentPage=all, The New Yorker, March 21, 2005. Retrieved February 4, 2010. source: Sass, Louis A. "'Hyped on Clarity': Diane Arbus and the Postmodern Condition". Raritan, volume 25, number 1, pp. 1–37, Summer 2005.
Source: Kimmelman, Michael, The Profound Vision of Diane Arbus: Flaws in Beauty, Beauty in Flaws, https://www.nytimes.com/2005/03/11/arts/design/the-profound-vision-of-diane-arbus-flaws-in-beauty-beauty-in.html, 1 November 2018, The New York Times, 11 March 2005

“You never fail until you stop trying.”

“Relearn astonishment, stop grasping for knowledge, lose the habit of the past.”
J. Agee, trans. (1989), p. 146
Das Geheimherz der Uhr [The Secret Heart of the Clock] (1987)

Remarks to the White House Conference on Small Business http://www.reagan.utexas.edu/archives/speeches/1986/081586e.htm (15 August 1986)
1980s, Second term of office (1985–1989)

Telephone, written by Lady Gaga, Rodney "Darkchild" Jerkins, LaShawn Daniels, Lazonate Franklin, and Beyoncé
Song lyrics, The Fame Monster (2009)

http://www.youtube.com/watch?v=jI_sg_mBSLk
About his singing.
Interview with Buenos Dias a Todos, 2008

"Solidarity song" [Solidaritätslied] (1931), trans. John Willett in Poems, 1913-1956, p. 186
Poems, 1913-1956 (1976)