Whatever is referred to must exist. Let us call this the axiom of existence. - John Searle

There are clear cases in which "understanding" literally applies and clear cases in which it does not apply; and these two sorts of cases are all I need for this argument.

Materialism ends up denying the existence of any irreducible subjective qualitative states of sentience or awareness.

Well, what does “good” mean anyway...? As Wittgenstein suggested, “good,” like “game,” has a family of meanings. Prominent among them is this one: “meets the criteria or standards of assessment or evaluation.”