No truly metaphysical question can ever be decisively settled one way or the other, and insofar as this assertion is itself metaphysical, it too is undecidable. This assertion is scandalous only from the position that would negate all metaphysics in the name of positivism, but in fact is equally derivable from that starting point by the usual sort of gödelian diagonalisation. In the same way it is necessarily ambiguous whether this concerns what is assertable or what is, but its consequences are nonetheless empirical.