From his sermon on Ephesians 2:19-22.
The papists brag enough about their agreement, and so they may very well do, for the devil possesses them in such a manner that they are completely stupified in it. There are, in fact, plenty of disputes and fights among them, and they snap at each other like cats and dogs when they are in their own gatherings, but yet they conspire together to uphold all ungodliness. We see their madness and diabolical stubbornness when they reason for the maintenance of their own lies against God’s truth. But St. Paul shows in what way we ought to agree, namely, not in dreams and fantasies, not in the things that men have put forward of their own wares, but in the doctrine of the prophets and apostles. Now seeing that the papists have banished the holy Scripture—and although they give the appearance of receiving it, they nevertheless obscure it, and utterly falsify and corrupt it by their own inventions—we thereby see that they are far off, from their account of themselves, in boasting themselves with full mouth to be God’s church; for seeing they do not have the doctrine of the prophets and apostles, they have no mark of the church at all. Even if men were ready to receive all things that are in holy Scripture, and that without contradiction, yet if they go on to mix their own fancies with them, Christianity is thereby already corrupted and confused. Now, they not only distort God’s truth with their own inventions, but also utterly pervert all, insomuch that God’s service is utterly corrupted by them. Poor souls are harried to and fro, and our Lord Jesus Christ is robbed of His glory, so that they make Him out to be a mere phantom, and attribute His office to this man and that man, like the handing out of some spoil or booty. Since we see then the papists so audaciously and madly turning God’s pure word upside down in that way, we may well conclude that, although they boast so much that they are the church, yet God disowns them, and even utterly abhors them, and that if a man does not get himself out of that den of thieves, it is impossible for him to be joined to our Lord Jesus Christ.
Thus you see that what we have to bear in mind is that to be joined to God by means of His only Son, and to be companions of the angels of paradise and brethren of the patriarchs, holy kings, and prophets, we must be banished out of these hellish assemblies that are in popedom, where it is apparent that Antichrist reigns and that Jesus Christ is utterly dispossessed of His right and sovereignty. And indeed, we see their cursed presumption in that they have been so bold as to say that the See of Rome is the foundation of the church. For they abuse these words of our Lord Jesus Christ in the sixteenth chapter of St. Matthew: ‘Thou art Peter, and upon this stone the church will be built” [Matt 16:18]. Now when Jesus Christ says that Peter shall be built upon Himself (that is to say, upon Jesus Christ) He does not mean to resign His office either to him or to any other, but thereby it appears that among all papists there has not been any reverence for the holy Scriptures, nor any desire to be taught, but that that was all one to them, so that they might set up a tyranny to crush the kingdom of our Lord Jesus Christ and to make it a ruin, if it were possible. They have made no conscience of manifest blasphemy, so much so that even little children ought to have spit in their faces considering the gross folly that has been among them. And in this it is also to be seen how the devil has reigned in total darkness, that God’s Word as buried, and even utterly wiped out, and the wretched world robbed of it for a time, in spite of the fact that it was their ordinary food.
So then, let us abhor all these blasphemies, assuring ourselves that we cannot be established, except in our Lord Jesus Christ, and that when we are once faithfully instructed in Him, we do not need to borrow elsewhere, because he has brought us whatever is necessary for our salvation. And it is not fitting that we should do Him such a great dishonour as to seek supplies here and there, but that we should keep ourselves wholly to Him. That therefore is the meaning of what St. Paul says here.
(Hear the entire sermon here.)