76 Bishops and religious superiors should not be deterred from this needful severity by fear of diminishing the number of priests for the diocese or institute. The Angelic Doctor St. Thomas long ago proposed this difficulty, and answers it with his usual lucidity and wisdom: "God never abandons His Church; and so the number of priests will be always sufficient for the needs of the faithful, provided the worthy are advanced and the unworthy sent away." The same Doctor and Saint, basing himself upon the severe words quoted by the fourth Ecumenical Council of the Lateran, observes to Our purpose: "Should it ever become impossible to maintain the present number, it is better to have a few good priests than a multitude of bad ones." It was in this sense that We Ourselves, on the solemn occasion of the international pilgrimage of seminarists during the year of Our priestly jubilee, addressing an imposing group of Italian Archbishops and Bishops, reaffirmed that one well trained priest is worth more than many trained badly or scarcely at all. For such would be not merely unreliable but a likely source of sorrow to the Church. What a terrifying account, Venerable Brethren, We shall have to give to the Prince of Shepherds, to the Supreme Bishop of souls, if we have handed over these souls to incompetent guides and incapable leaders.
Source: Ad Catholici Sacerdotii (Vatican.va)