55 Thus the Divine Letter will become for the future priests of the Church a pure and never failing source for their own spiritual life, as well as food and strength for the sacred office of preaching which they are about to undertake. If the professors of this most important matter in the Seminaries accomplish all this, then let them rest joyfully assured that they have most efficaciously contributed to the salvation of souls, to the progress of the Catholic faith, to the honor and glory of God, and that they have performed a work most closely connected with the apostolic office.
Source: Divino Afflante Spiritu (Vatican.va)