 Molto discusses a problem for the model which arises from the transitivity of parthood and the axiom that things which are improper parts of one another must have all their proper parts in common. If the body of the incarnate Son is a proper part of him, then given Molto’s model of the Trinity, this body would also have to be a proper part of God, of the Father, and of the Holy Spirit – claims which most Christian theologians would reject. In response, he adds three further elements to the model, as shown here: