The purpose, therefore, which priests pursue in their ministry and by their life is to procure the glory of God the Father in Christ. That glory consists in this-that men working freely and with a grateful spirit receive the work of God made perfect in Christ and then manifest it in their whole lives. Hence, priests, while engaging in prayer and adoration, or preaching the word, or offering the Eucharistic Sacrifice and administering the other sacraments, or performing other works of the ministry for men, devote all this energy to the increase of the glory of God and to man's progress in the divine life. All of this, since it comes from the Pasch of Christ, will be crowned by the glorious coming of the same Lord, when he hands over the Kingdom to God the Father.
(Pope Paul VI, PRESBYTERORUM ORDINIS, 1965, #2)