Thomas Goodwin on Adoption

Thomas Goodwin, in his Ephesians sermons, makes this point about salvation: that there are two kinds of benefits: benefits of reputation (consisting of God’s actions upon us and towards us), and benefits of real change (the working of God in us). See volume 2 (of his complete works), pp. 314-316 for this distinction. He argues against the Roman Catholic understanding of adoption in a way that is unique to theology, I believe. Maybe others who know more can correct me on this. Here is what he says:

They (the Roman Catholics, LK), to maintain that we are justified, not by being accounted righteous, but by being inherently righteous, say that our adoption doth not consist in a relation to God as a Father, but in the image of God wrought in us. Why, if that adoption did imply a real change in the person that is made a son, it must make a real change in the father, for father and son are relatives; and so when God becomes a Father to us, you must make a real change in him, for always for things that are relata there is the same reason, as we use to say.

A very interesting argument, I think. What say you?