Despite superficially resembling some self-referential paradoxes, if the heuristic can stand up to itself, it's not a paradox. You try to prove it wrong, and you fail, so you keep it, which, lo, is exactly what I've done. (Or perhaps more precisely, while it is not a perfect fit and I could quibble with details myself, it is the
best one-sentence summary of true science in my opinion, and I'm familiar with most of the usual ones, and aware that I've only seen this variant in one or two other places even so.) No paradox, no contradiction, no insanity.
Alas, if you're looking for an excuse to tie either yourself or me up in some sophomoric philosophical conundrum, this doesn't do it. But there's no lack of such things if you look, so don't be disappointed. Keep on trucking. May I suggest Godel, Escher, Bach: An Eternal Golden Braid if you would like the industrial strength version rope, err, braid to tie yourself in?