6 The Mexican priests thus formed according to the Heart of Jesus Christ will feel that in the actual conditions of their country (of which We spoke in Our Apostolic Letter Paterna Sane Solicitudo of February 2, 1926) - which are so similar to those of the early times of the Church, when the Apostles appealed for the collaboration of the laity - it would be very difficult to reconquer for Christ so many misguided souls without the providential assistance which the laity give by means of Catholic Action. More so since at times grace prepares among them generous souls ready to develop most fruitful activity if they encounter a learned and holy clergy capable of understanding and guiding them.
Source: Nos Es Muy Conocida (Vatican.va)