The Art of Subsisting

Like nature is an end, end that for the sake of which a thing subsists. This being the case, there are two arts which rule over, and possess a knowledge of matter. Vis, the art which uses it, and that which is architectonic of effective arts. They differ however so far as the one, vis, the architectonic, has a knowledge of form, but the other is called architectonic as being productive of matter. In those productions therefore, which are according to art, we make the matter for the sakeof the work, but in natural productions it already exists. Again, matter belongs to the class of relatives, for a different matter pertains to a different