"It is the mission of the Magisterium to affirm the definitive character of the Covenant established by God through Christ with His People in a way which is consistent with the 'eschatological' nature of the event of Jesus Christ. It must protect God's People from the danger of deviations and confusion, guaranteeing them the objective possibility of professing the authentic faith free from error, at all times and in diverse situations. It follows that the sense and the weight of the Magisterium's authority are only intelligible in relation to the truth of Christian doctrine and the preaching of the true Word." - Donum Veritatis
"The Roman Pontiff and the bishops, in view of their office and the importance of the matter, by fitting means diligently strive to inquire properly into that revelation and to give apt expression to its contents; but a new public revelation they do not accept as pertaining to the divine deposit of faith." - Lumen Gentium
"Let no Christian therefore, whether philosopher or theologian, embrace eagerly and lightly whatever novelty happens to be thought up from day to day, but rather let him weigh it with painstaking care and a balanced judgment, lest he lose or corrupt the truth he already has, with grave danger and damage to his faith." - Humani Generis