You can always turn a claim into a logically equivalent claim of the non-existence of any counterexamples.

    “For every instance, e equals mc²”

is logically equivalent to

    “There is no instance where e does not equal mc².”

That combined with your belief that claims of non-existence can't be held with any degree of certainty means you believe that no claim can ever be held with any degree of certainty. Which is not a very interesting insight.