[1] Joseph Tixeront, Holy Orders and Ordination; A Study in the History of Dogma, p. 320. Link [2] Ludwig Ott, Fundamentals of Catholic Dogma, p. 10. Link [3] Ibid. [4] Summa Theologia III Supplement, Question 35, Article 5. Link [5] Summa Theologia III Supplement, Question 40, Article 5. Link [6] Pope Paul VI, Lumen Gentium, Para 20, Link [7] Ibid, 22 [8] Translation by John Daly, in his refutation of Michael Davies. See Michael Davies — An Evaluation, p. 339, link. Daly also cites Theologia Moralis, Book 6, n. 738 for St. Alphonsus Liguori’s opinion.