20 You certainly have not forgotten how Our Predecessor, Benedict XV of happy memory, was saddened by this fact. He wrote: "It is a matter of genuine sorrow that there still exist countries to which the Catholic Faith was brought centuries ago but where, in spite of that fact, one does not find even now native priests except possibly those occupying minor posts; also, that there are races who were converted long ago and who have risen from a state of barbarism to such a high degree of civilization that they have produced men of standing in every profession and walk of civil life; yet these very people, despite the fact that they have lived under the saving influence of the Gospel and of the Church for centuries, have not been able to produce a bishop to rule them or priests whose teaching authority is respected as it should be by their fellow citizens." (Apostolic Letter Maximum Illud )
Source: Rerum Ecclesiae (Vatican.va)