26 In clear and simple fashion he acknowledges the infallible magisterium of the Roman Pontiff in questions of faith and morals. For, recognizing the errors of Abelard, who when he "speaks of the Trinity savors of Arius; when of grace, of Pelagius; when of the person of Christ, of Nestorious," "who . . . predicated degrees in the Trinity, measure in majesty, numbers in eternity"; and in whom "human reason usurps for itself everything, leaving nothing for faith"; he not only shatters, weakens and refutes his subtle, specious and fallacious tricks and sophisms, but also, on this subject, writes to Our predecessor of immortal memory, Innocent II, these words of utmost importance: "Your See should be informed of all dangers that may arise, especially those that touch faith. For I consider it meet that damage to the faith be repaired in the particular place where faith is perfectly whole. These indeed are the prerogatives of this See. . . It is time, most loving Father, that you recognized your pre-eminence. Then do you really take the place of Peter, whose See you hold, when by your admonitions you strengthen hearts weak in faith; when, by your authority, you break those who corrupt the faith."
Source: Doctor Mellifluus (Vatican.va)