22 Having before our eyes the joys of the priestly life, this holy synod cannot at the same time overlook the difficulties which priests experience in the circumstances of contemporary life. For we know how much economic and social conditions are transformed, and even more how much the customs of men are changed, how much the scale of values is changed in the estimation of men. As a result, the ministers of the Church and sometimes the faithful themselves feel like strangers in this world, anxiously looking for the ways and words with which to communicate with it. For there are new obstacles which have arisen to the faith: the seeming unproductivity of work done, and also the bitter loneliness which men experience can lead them to the danger of becoming spiritually depressed. The world which today is entrusted to the loving ministry of the pastors of the Church is that which God so loved that he would give his only Son for it. Truly this world, indeed weighed down with many sins but also endowed with many talents, provides the Church with the living stones which are built up into the dwelling place of God in the Spirit. This same Holy Spirit, while impelling the Church to open new ways to go to the world of today, suggests and favors the growth of fitting adaptations in the ministry of priests. Priests should remember that in performing their office they are never alone, but strengthened by the power of Almighty God, and believing in Christ who called them to share in his Priesthood, they should devote themselves to their ministry with complete trust, knowing that God can cause charity to grow in them. Let them be mindful of their brothers in the priesthood as well, and also of the faithful of the entire world who are associated with them. For all priests cooperate in carrying out the saving plan of God, that is, the Mystery of Christ, the sacrament hidden from the ages in God, which is only brought to fulfillment little by little through the collaboration of many ministries in building up the Body of Christ until it grows to the fullness of time. All this, hidden with Christ in God, can be uniquely perceived by faith. For the leaders of the People of God must walk by faith, following the example of faithful Abraham, who in faith "obeyed by going out into a place which he was to receive for an inheritance; and he went out not knowing where he was going" (Heb 11:8). Indeed, the dispenser of the mysteries of God can see himself in the man who sowed his field, of whom the Lord said: "then sleep and rise, night and day, and the seed should sprout without his knowing" (Mk 4:27). As for the rest, the Lord Jesus, who said: "Take courage, I have overcome the world," (Jn 16:33) did not by these words promise his Church a perfect victory in this world. Certainly this holy synod rejoices that the earth has been sown with the seed of the Gospel which now bears fruit in many places, under the direction of the Holy Spirit who fills the whole earth and who has stirred up a missionary spirit in the hearts of many priests and faithful. Concerning all this, this holy synod gives fervent thanks to the priests of the entire world. "Now to him who is able to accomplish all things in a measure far beyond what we ask or conceive in keeping with the power that is at work in us-to him be glory in the Church and in Christ Jesus" (Eph 3:20-21).
Source: Presbyterorum Ordinis (Vatican.va)