Ad Petri Cathedram §71

⁷¹ The Catholic Church, of course, leaves many questions open to the discussion of theologians. She does this to the extent that matters are not absolutely certain. Far from jeopardizing the Church's unity, controversies, as a noted English author, John Henry Cardinal Newman, has remarked, can actually pave the way for its attainment. For discussion can lead to fuller and deeper understanding of religious truths; when one idea strikes against another, there may be a spark.(25)