Chapter 21 — Part II: The Sacraments — Holy Orders
Section 70. Holiness Of Life — The chief and most necessary quality requisite in him who is to be ordained a priest is that he be recommended by integrity of life and morals: first because, by procuring or permitting his ordination while conscious of mortal sin, a man renders himself guilty of a new and enormous crime; and secondly, because the priest is bound to give to others the example of a holy and innocent life.