17 This holy and most urgent intention should have the principal place in the prayers of each priest. Those who have been called to the sacred orders of the contemplative life are to pray for this special intention, and the faithful, when reciting the rosary so highly commended by the Blessed Virgin at Fatima, should entreat this same Virgin to intercede in favor of this divine vocation in order that the missions will flourish.
Source: Saeculo Exeunte Octavo (Vatican.va)