4610. In the entire body, there is nothing else that constitutes the life than the changes and variations of the forms in the substances there: as, for example, when man speaks, then is varied, according to every word, or sound of articulation, the form of the glottis, of the trachea, of the lungs, of the throat, of the tongue, of the mouth, and of the plane about the mouth. Untold numbers of such variations of form are established there within a minute, although this is in the body. Hence is the speech of man. What may there not be in the interiors of man, where all things are more perfect, and thousands and myriads of variations exist in the time when there is but one in the exteriors, or corporeals!