26 But what have we to do with the emperor? But I have already said that we are treating of human right. And yet the apostle would have us obey kings, would have us honor kings, and said, “Honor the king.” Do not say, What have I to do with the king? as in that case, what have you to do with the possession? It is by the rights derived from kings that possessions are enjoyed. You have said, What have I to do with the king? Say not then that the possessions are yours; because it is to those same human rights, by which men enjoy their possessions, you have referred them.
But it is with divine right I have to do, says he. Well, let us read the Gospel; let us see how far extends the Catholic Church of Christ, upon whom the dove came, which taught, “This is He that baptizes.” In what way, then, can he possess by divine right, who says, “I baptize;” while the dove says, “This is He that baptizes;” while the Scripture says, “My dove is one, the only one of her mother”? Why have you torn the dove?— nay, rather, have torn your own bowels, for while you are yourselves torn to pieces, the dove continues entire. Therefore, my brethren, if, driven from every point, they have nothing to say, I will tell them what to do; let them come to the Catholic Church, and together with us, they will have not only the earth, but Him also who made heaven and earth.
Source: Tractates on the Gospel of John (New Advent)