No sooner, in fact, “is the Word made flesh” (John, 1:14) than he shows Himself to the world vested with a priestly office, making to the Eternal Father an act of submission which will continue uninterruptedly as long as He lives: “When He cometh into the world he saith. . . ‘behold I come . . . to do Thy Will. (Heb. 10:5-7) This act He was to consummate admirably in the bloody Sacrifice of the Cross:  “It is in this will we are sanctified by the oblation of the Body of Jesus Christ once.” (Heb.10:10)  Pope Pius XII, Mediator Dei #17