But Hartshorne points out: “What is insufficiently noted here is that quantity may, after all, have a value which is not attainable without it.” Anselm’s Discovery, p. 27] I won’t get into his reasoning here.
So there appears to be a dilemma that “greatest conceivable quantity” is impossible (can always add 1 more) and "greatest conceivable quality devoid of quality appears likewise to be impossible. Hartshorne resolves the dilemma by first noting an ambiguity in the definition. “None greater can be conceived” may mean, “no greater individual” or it may mean, “no greater thing or entity.” If the latter, then not only can no other individual be conceived superior; the same individual cannot be conceived superior to itself. The resolution, then, is to admit that God is indeed surpassable, but only by Himself.
Hartshorne then concludes at p. 29: If God is surpassable, even though by Himself, then He can include quantity in His quality, without the quantity being that presumably impossible thing, an unsurpassable quantity. The divine quantity will be surpassable, but only by God himself. Now we have none of the contradictions we have been worrying about. god need not be the apparent impossibility, a quality wholly independent of quantity, nor that other impossibility, an unsurpassable quantity."