It is similar in the human body. There, all the parts are goods of use in a most perfect form. And as they are in a most perfect form, they are felt as a one; nevertheless they are all different, and in each of these there are different things in their own series and their own order. There are the five organs of sense, the several viscera, the organs of generation, several in each sex; there are the external members; there are still more things of the mind, that is, of the will and the understanding.