5 Then, again, it is necessary to realize that the number of missionaries abroad is far from adequate to serve the existing Christian communities. This deficiency is plainly evident from the mission statistics. The missionaries in India keep on imploring the Sacred Congregation for more preachers of the Gospel. Now, if there are not enough foreign priests to care for souls, what will happen in the future when the number of Christians will have multiplied? Nor, indeed, is there any reason to hope that the number of missionaries will increase proportionately. Consequently, if we want to be concerned for the salvation of India and the establishment of Christianity in that immense region on a firm foundation, we will have to select candidates from the native people, who after careful training will assume priestly functions and duties.
Source: Ad Extremas (Vatican.va)