“If something cannot go on forever, it will stop.”
Congressional testimony in 1976, in reference to a then-current economic trend of rising international trade deficits.
Herb Stein's Unfamiliar Quotations http://www.slate.com/id/2561/
Source: A Symposium on the 40th Anniversary of the Joint Economic Committee, Hearings Before the Joint Economic Committee, Congress of the United States, Ninety-Ninth Congress, First Session; Panel Discussion: The Macroeconomics of Growth, Full Employment, and Price Stability, January 16, 1976, 262, I recently came to a remarkable conclusion which I commend to you and that is that if something cannot go on forever it will stop. So, what we have learned about all these things is that the Federal debt cannot rise forever relative to the GNP. Our foreign debt cannot rise forever relative to the GNP. But, of course, if they can't, they will stop., June 4, 2018 https://babel.hathitrust.org/cgi/pt?id=umn.319510030778307;view=1up;seq=270,
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Herbert Stein 1
American economist 1916–1999Related quotes

“But it's not going to stop.
It's not going to stop.
It's not going to stop
'Til you wise up.”
"Wise Up" Clip from Magnolia of performances by Mann and cast members https://www.youtube.com/watch?v=aNmKghTvj0E · Live at St. Ann's Warehouse https://www.youtube.com/watch?v=e3D7xplBYNY
Song lyrics, Magnolia: Music from the Motion Picture (1999)
Context: You're sure
There's a cure.
And you have finally found it.
You think
One drink
Will shrink you 'til you're underground
And living down.
But it's not going to stop.
It's not going to stop.
It's not going to stop
'Til you wise up.

"Hold Me" - Live performance at the Tin Angel (10 May 1996) http://www.youtube.com/watch?v=LcXOiiyHE_c
Building the Colossus (1994)