Catechism of the Catholic Church §1548 — excerpt
In the ecclesial service of the ordained minister, it is Christ himself who is present to his Church as Head of his Body, Shepherd of his flock, high priest of the redemptive sacrifice, Teacher of Truth.
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.
Also cites: LG 10 · 28 · SC 33 · CD 11 · PO 2 · 6 · Pius XII, encyclical, Mediator Dei: AAS, 39 (1947) 548 · St. Thomas Aquinas, STh III, 22, 4c