It is, therefore, extremely important to insist that when I say: Two things can differ in intrinsic value, only when they have different intrinsic natures, I am using the expression 'having different intrinsic natures' in the latter sense and not the former: in a sense in which the mere fact that two things are two, or differ numerically, does not imply that they have different intrinsic natures, but in which they can be said to have different intrinsic natures, only where, besides differing numerically, they are also not exactly alike.