74 This procedure has the exceptional result of allowing the wise and well-planned establishment of specialized forms of the priestly ministry, such as taking charge of teaching the secular and sacred sciences for which the local clergy have not been trained. We are happy to encourage these timely and fruitful undertakings. If this course of action is taken with due preparation, very important advantages will accrue to the Catholic Church in present-day Africa, which has its full measure of both difficulties and hopes.
Source: Fidei Donum (Vatican.va)