"One thing most of us agree on is that the universe exists (people who deny that usually follow some trade other than science), so if some theoretical particle interaction would lead ultimately to the nonexistence of the universe, then you can save a lot of electricity by not trying to demonstrate it."

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If one denies that, when the meaning is true, then the meant is what is so, one rejects propositional truth. If the rejection is universal, then it is the self-destructive proposition that there are no true propositions. If the rejection is limited to the dogmas, then it is just a roundabout way of saying that all the dogmas are false.

— Bernard Lonergan