The Pope may err, and that in two ways, either because he is erroneously informed, or from malice. As to the latter cause we leave that to the judgment of God, and believe rather that he has been misinformed. In our own case I can prove that he has been falsely persuaded. Therefore any one who obstinately upholds the excommunication and affirms that I ought not to preach these doctrines is fighting against the kingdom of Christ, and supporting the kingdom of Satan, and is himself a heretic, and deserves to be excluded from the Christian community.

Sermon (18 February 1498), as translated in History of the Popes (1901) by Ludwig Pastor, as translated by Frederick Ignatius Antobus, Vol. 6, p. 26