The doubter's world is a world in which, as we journey, we shall
discover four features that are especially noteworthy and that accord
fully with the principles of Descartes as well as with the findings of
our own confession of doubt. Thus, in the order, or suppose I say in the
itinerary, here to be followed: (1) Reality, without finality, in all
things; (2) perfect sympathy between the spiritual and the material; (3)
genuine individuality; and (4) for whatever is indeed real, immortality.