10 But truth itself and the knowledge of Our duty demand that We propose for your careful attention the following points: First, these preachers of the gospel, who left their own beloved countries to cultivate among you the Master's field with their labor and sweat, are not moved by earthly motives. They seek only, and desire nothing more than, to illumine your people with the light of Christianity, to teach them Christian customs and to help them with a supernatural charity. In the second place, even when the increased number of Chinese clergy will no longer need the aid of foreign missionaries, the Catholic Church in your nation, as in all the others, will not be able to be ruled with "autonomy of government," as they say today.
Source: Ad Sinarum Gentem (Vatican.va)