Your see, however, which is called the Court of Rome, and which neither you nor any man can deny to be more corrupt than any Babylon or Sodom, and quite, as I believe, of a lost, desperate, and hopeless impiety, this I have verily abominated, and have felt indignant that the people of Christ should be cheated under your name and the pretext of the Church of Rome; and so I have resisted, and will resist, as long as the spirit of faith shall live in me. Not that I am striving after impossibilities, or hoping that by my labours alone, against the furious opposition of so many flatterers, any good can be done in that most disordered Babylon; but that I feel myself a debtor to my brethren, and am bound to take thought for them, that fewer of them may be ruined, or that their ruin may be less complete, by the plagues of Rome. For many years now, nothing else has overflowed from Rome into the world--as you are not ignorant--than the laying waste of goods, of bodies, and of souls, and the worst examples of all the worst things. These things are clearer than the light to all men; and the Church of Rome, formerly the most holy of all Churches, has become the most lawless den of thieves, the most shameless of all brothels, the very kingdom of sin, death, and hell; so that not even antichrist, if he were to come, could devise any addition to its wickedness.
...For whatever the efforts of all minds can contrive against the confusion of that impious Court will be advantageous to you and to your welfare, and to many others with you. Those who do harm to her are doing your office; those who in every way abhor her are glorifying Christ; in short, those are Christians who are not Romans.
De libertate christiana (1520) [I: Letter to Pope Leo X]
La Chiesa di Roma ... è il principato della fede nostra
The Church of Rome ... is the domain of our faith.
Saint Catherine of Siena