Fidei Donum §22

²² Any delay or hesitation is full of danger. For the people of Africa have made as much progress toward civilization during the past few decades as required many centuries among the nations of Western Europe. Thus they are more easily unsettled and confused by the introduction of theoretical and applied scientific methods, with the result that they tend to be unduly inclined to a materialistic outlook on life. Hence a condition of affairs is sometimes brought about that is difficult to correct and in the course of time may prove to be a great obstacle to the growth of faith, whether in individuals or in society at large. For this reason it is imperative that help should be given now to the shepherds of the Lord's flock in order that their apostolic labors may correspond to the ever-growing needs of the times.