In his defense of apostolic Christianity, Irenaeus developed the concept of the regula fidei or the “rule of faith.”10 The regula fidei was essentially the content of the profession of faith that every catechumen was asked to recite from memory before his or her baptism. It was a summary of the faith taught by the Apostles and committed to their disciples.11 Whereas the Gnostics appealed to a secret unwritten tradition, Irenaeus appealed to the public tradition of the Church. Does this mean that
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