xi
necessary that the progression of beings should be continued, and that no vacuum should intervene either in incorporeal or corporeal natures. It is also necessary that every thing which has a natural progression should proceed through similitude. In consequence of this, it is likewise necessary that every producing principle should generate a number of the same order with itself, viz. nature, a natural number; soul, one that is psychical (i. e. belonging to soul); and intellect an intellectual number. For if whatever possesses a power of generating, generates similars prior to dissimilars, every cause must deliver its own form and characteristic peculiarity to its progeny; and before it generates that which gives subsistence to progressions, far distant and separate from its nature, it must constitute things proximate to itself according to essence, and conjoined with it through similitude. It is, therefore, necessary from these premises, since there is one unity, the principle of the universe, that this unity should produce from itself, prior to every thing else, a multitude of natures characterized
