28 Finally, the priest, in another way, follows the example of Christ. Of Him it is written that He "passed the whole night in the prayer of God" and "ever lives to make intercession for us"; and like Him, the priest, is public and official intercessor of humanity before God; he has the duty and commission of offering to God in the name of the Church, over and above sacrifice strictly so-called, the "sacrifice of praise," in public and official prayer; for several times each day with psalms, prayers and hymns taken in great part from the inspired books, he pays to God this dutiful tribute of adoration and thus performs his necessary office of interceding for humanity. And never did humanity, in its afflictions, stand more in need of intercession and of the divine help which it brings. Who can tell how many chastisements priestly prayer wards off from sinful mankind, how many blessings it brings down and secures?
Source: Ad Catholici Sacerdotii (Vatican.va)