XVII.

Argument:  There is nothing accidental in God.  To assume humanity is an

accident.  Therefore Christ is not God.

Response:  In philosophy this is true; but in theology we have our own rules. 

When we portray the union so that the divinity in Christ is as it were a

substance, but his humanity as it were an accidental quality, like whiteness

or blackness, this is not said properly or aptly, but we speak thus so that

it can be understood in some way.  But that unity of the two natures in one

person is the greatest possible, so that they are equally predicated, and

communicate their properties to the person, as if he were solely God or

solely man.