[dagunk]

“seemingly unbelievable” TANSTAAFL

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“There Ain’t No Such Thing As A Free Lunch” - Asimov

And:

Rules of Thermodynamics:
Zeroth: “You must play the game.”
First: “You can’t win.”
Second: “You can’t break even.”
Third: “You can’t quit the game.”
— C.P. Snow

[HartleyMBaldwin]

Heinlein, not Asimov.

[Valpal1]

It was actually Heinlien that popularized the acronym in “The Moon is a Harsh Mistress”.