Scripture and Tradition

"The magisterium of the apostles’ successors does not juxtapose a second authority to Scripture, but rather forms part of its very structure. This "living voice" is not meant to reduce the authority of Scripture, or to limit it or substitute it for something else. On the contrary, its mission is to ensure the unchangeability of Scripture, to guarantee that it will not be manipulated, to conserve intact, in the midst of disputes, its transparency, its univocal status. There is thus a mysterious mutual interaction. Scripture sets the measure and limits to the 'living voice'; and the 'living voice' guarantees that Scripture will not be manipulated."

-Joseph Cardinal Ratzinger

Via SJVB