“Never lose hope, be persistent and stubborn and never give up. There are many instances in history where apparent losers suddenly turn out to be winners unexpectedly, so you should never conclude all hope is lost.”
Interview with Ted Kaczynski http://web.archive.org/web/20061003044754/www.spiritoffreedom.org.uk/profiles/ted.html
Interviews
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Theodore Kaczynski 49
American domestic terrorist, mathematician and anarchist 1942Related quotes

Pope John Paul II, Anthony F. Chiffolo (Editor): Pope John Paul II: In My Own Words https://www.goodreads.com/quotes/469522-i-plead-with-you--never-ever-give-up-on-hope-never. Published August 6th 2002 by Gramercy Books (first published October 1998).
Other Quotes by Pope John Paul II

“Never give up hope, try with confidence; you will be successful.”
Source: Quoted in Animation short film Try, which was written and directed by him in 2010.

“I never lost hope, and never did I despair of coming back alive.”
Source: "Nine Feet Tall" in Air Force Magazine https://www.airforcemag.com/article/0212tall/ (1 February 2012)

“Where's the pleasure in bein' the winner if the loser ain't alive to know they've lost?”
Source: Witches Abroad

“I only hope that we never lose sight of one thing — that it all started with a mouse.”
What Is Disneyland television program (27 October 1954)
Variants:
I only hope that we don't lose sight of one thing — that it all started with a mouse.
As quoted in The Story of Disney (2004) by Adele D. Richardson, p. 41
Variant: I only hope that we don’t lose sight of one thing — that it was all started by a mouse.