60 Our reflection on the beauty, importance and intimate fittingness of holy virginity for the ministers of Christ and His Church makes it incumbent on those who hold the office of teacher and pastor of that Church to take steps to assure and promote its positive observance, from the first moment of preparation to receive such a precious gift. In fact, the difficulties and problems which make the observance of chastity very painful or quite impossible for some, spring, not infrequently, from a type of priestly formation which, given the great changes of these last years, is no longer completely adequate for the formation of a personality worthy of a "man of God." (114)
Source: Sacerdotalis Caelibatus (Vatican.va)