No Self-Evident Truths
A self-undermining maxim: there are no self-evident truths, not even this one. Axioms are chosen, not obvious.
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Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2016-07-04-no-self-evident-truths/ (CC BY-NC 4.0)Transcript
"There is no such thing as a self-evident truth, not even this one." [First person] "But you MUST accept my axioms!" [Second person] "If that were true, they wouldn't need to be axioms."