“In life two negatives don't make a positive. Double negatives turn positive only in math and formal logic. In life things just get worse and worse and worse.”
Source: Story: Substance, Structure, Style, and the Principles of Screenwriting
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Robert McKee 11
American academic specialised in seminars for screenwriters 1941Related quotes

“You cannot have a positive life and a negative mind.”
Source: Battlefield of the Mind: Winning the Battle in Your Mind
“Negative get conversed in positive”
The lecture in Ashland, Oregon (8th of July 2005)

Quoted from his first book https://en.wikipedia.org/wiki/Success_and_Failure_Based_on_Reason_and_Reality, "Success and Failure Based on Reason and Reality" https://www.amazon.co.uk/SUCCESS-FAILURE-BASED-REASON-REALITY/dp/9970983903/ on Amazon, (July 2018)

“Always turn a negative situation into a positive situation.”
The Independent, The Independent, Professor Sidney Morgenbesser: Philosopher celebrated for his withering New York Jewish humour http://www.independent.co.uk/news/obituaries/professor-sidney-morgenbesser-550224.html, 6 August 2004. The Times, Sidney Morgenbesser: Erudite and influential American linguistic philosopher with the analytical acuity of Spinoza and the blunt wit of Groucho Marx https://www.thetimes.co.uk/article/sidney-morgenbesser-5cz8gg8qfvm, September 8, 2004. (Some have quoted it as "Yeah, right.") Block, Melissa (August 2, 2004). " The Witty Professor: Sidney Morgenbesser https://www.npr.org/templates/story/story.php?storyId=3810783". NPR.org. Baum, Devorah (2017). The Jewish Joke: An essay with examples (less essay, more examples) https://books.google.com/books/about/The_Jewish_Joke.html?id=vwD0DQAAQBAJ. Profile Books. ISBN <bdi>9781782831938</bdi>.

“"Make an obstacle an opportunity, make a negative a positive.”

“You cannot expect to live a positive life if you hang with negative people.”