384. Since all the mind's constituents are connected with the will and intellect, and all the body's constituents with the heart and lungs, therefore in the head the brain is divided into two structures, and these are as distinct from each other as the will and intellect from each other. The cerebellum serves primarily the will, and the cerebrum primarily the intellect. In the body, the heart and lungs are likewise separated from the rest of the organs there. They are separated by the diaphragm and enveloped in their own covering, called the pleura, and they form that part of the body called the chest. In the remaining constituents of the body, called its members, organs and viscera, these two elements are conjoined. Consequently the parts exist in pairs, such as the arms and hands, loins and feet, eyes and nostrils, and, inside the body, the kidneys, ureters, and testes. Even organs that do not exist in pairs are divided into a right and left side-including the cerebrum itself into two hemispheres, the heart itself into two ventricles, and the lungs themselves into two lobes. Moreover, the right side of these relates to the goodness of truth, and the left side to the truth of good. Or to say the same thing, the right side relates to the goodness of love from which arises the truth of wisdom, and the left side to the truth of wisdom arising from the goodness of love. Consequently, because the conjunction of goodness and truth is a reciprocal one, and by that conjunction they become as though one, therefore these pairs in the human being, too, operate together and conjointly in their functions, movements, and perceptions.