The Principles of Natural Things

The principles of natural things are two, and they may also be said to be three. They are partly contraries, as if someone should speak of that which is musical or void of music. But the subject nature may be scientifically known according to analogy. This therefore is one principle, though it is not one, nor being in such a manner as this particular individual thing. Another principle is form, and further still the contrary to this privation. It is not however yet manifest, whether form, or the subject, is the essence of a thing,. but that the principles are three, and how they are three has been declared above.