Bull of Pope Leo X issued June 15, 1520
Arise, O Lord, and judge your own cause. Remember your reproaches to those who are filled with foolishness all through the day. Listen to our prayers, for foxes have arisen seeking to destroy the vineyard whose winepress you alone have trod. When you were about to ascend to your Father, you committed the care, rule, and administration of the vineyard, an image of the triumphant church, to Peter, as the head and your vicar and his successors. The wild boar from the forest seeks to destroy it and every wild beast feeds upon it.
Rise, Peter, and fulfill this pastoral office divinely entrusted to you as mentioned above. Give heed to the cause of the holy Roman Church, mother of all churches and teacher of the faith, whom you by the order of God, have consecrated by your blood. Against the Roman Church, you warned, lying teachers are rising, introducing ruinous sects, and drawing upon themselves speedy doom. Their tongues are fire, a restless evil, full of deadly poison. They have bitter zeal, contention in their hearts, and boast and lie against the truth.
We beseech you also, Paul, to arise. It was you that enlightened and illuminated the Church by your doctrine and by a martyrdom like Peter's. For now a new Porphyry rises who, as the old once wrongfully assailed the holy apostles, now assails the holy pontiffs, our predecessors.
Rebuking them, in violation of your teaching, instead of imploring them, he is not ashamed to assail them, to tear at them, and when he despairs of his cause, to stoop to insults. He is like the heretics "whose last defense," as Jerome says, "is to start spewing out a serpent's venom with their tongue when they see that their causes are about to be condemned, and spring to insults when they see they are vanquished." For although you have said that there must be heresies to test the faithful, still they must be destroyed at their very birth by your intercession and help, so they do not grow or wax strong like your wolves. Finally, let the whole church of the saints and the rest of the universal church arise. Some, putting aside her true interpretation of Sacred Scripture, are blinded in mind by the father of lies. Wise in their own eyes, according to the ancient practice of heretics, they interpret these same Scriptures otherwise than the Holy Spirit demands, inspired only by their own sense of ambition, and for the sake of popular acclaim, as the Apostle declares. In fact, they twist and adulterate the Scriptures. As a result, according to Jerome, "It is no longer the Gospel of Christ, but a man's, or what is worse, the devil's."
Let all this holy Church of God, I say, arise, and with the blessed apostles intercede with almighty God to purge the errors of His sheep, to banish all heresies from the lands of the faithful, and be pleased to maintain the peace and unity of His holy Church.
For we can scarcely express, from distress and grief of mind, what has reached our ears for some time by the report of reliable men and general rumor; alas, we have even seen with our eyes and read the many diverse errors. Some of these have already been condemned by councils and the constitutions of our predecessors, and expressly contain even the heresy of the Greeks and Bohemians. Other errors are either heretical, false, scandalous, or offensive to pious ears, as seductive of simple minds, originating with false exponents of the faith who in their proud curiosity yearn for the world's glory, and contrary to the Apostle's teaching, wish to be wiser than they should be. Their talkativeness, unsupported by the authority of the Scriptures, as Jerome says, would not win credence unless they appeared to support their perverse doctrine even with divine testimonies however badly interpreted. From their sight fear of God has now passed.
[after a list of specific errors taught by Luther...]
With the advice and consent of these our venerable brothers, with mature deliberation on each and every one of the above theses, and by the authority of almighty God, the blessed Apostles Peter and Paul, and our own authority, we condemn, reprobate, and reject completely each of these theses or errors as either heretical, scandalous, false, offensive to pious ears or seductive of simple minds, and against Catholic truth. By listing them, we decree and declare that all the faithful of both sexes must regard them as condemned, reprobated, and rejected . . . We restrain all in the virtue of holy obedience and under the penalty of an automatic major excommunication....
Moreover, because the preceding errors and many others are contained in the books or writings of Martin Luther, we likewise condemn, reprobate, and reject completely the books and all the writings and sermons of the said Martin, whether in Latin or any other language, containing the said errors or any one of them; and we wish them to be regarded as utterly condemned, reprobated, and rejected. We forbid each and every one of the faithful of either sex, in virtue of holy obedience and under the above penalties to be incurred automatically, to read, assert, preach, praise, print, publish, or defend them. They will incur these penalties if they presume to uphold them in any way, personally or through another or others, directly or indirectly, tacitly or explicitly, publicly or occultly, either in their own homes or in other public or private places. Indeed immediately after the publication of this letter these works, wherever they may be, shall be sought out carefully by the ordinaries and others [ecclesiastics and regulars], and under each and every one of the above penalties shall be burned publicly and solemnly in the presence of the clerics and people.