carefully guards this preaching and this faith which she has received, as if she dwelt in one house. She likewise believes these things as if she had but one soul and one and the same heart. She preaches, teaches, and hands them down harmoniously, as if she possessed but one mouth. For though the languages throughout the world are different, nevertheless the meaning of the tradition is one and the same.3 This rule of faith had two functions. First, it was educational. It formed the basis of catechesis