One also can't actually conceive of such a thing, you're correct. We can have the idea that such a being might possibly be conceivable, like a linguistic positi

One also can't actually conceive of such a thing, you're correct. We can have the idea that such a being might possibly be conceivable, like a linguistic positing of a perfect being, but as you say, actually conceiving the being will take you your whole life and still not even get close to a conception of the actual being. One of the many places the argument falls apart for me. Anselm is also the fool for considering that such a thing can exist in the mind of a fool.