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 “teaching” of St. Matthew as a “preaching,” and mentions, instead of the intrinsic guarantee of infallibility, the extrinsic signs of authority and sanction. “Go ye into the whole world and preach (κηρύξατε) the Gospel to every creature [as an authorized message from the Creator and Sovereign Lord to all mankind as His creatures]. He that believeth [your preaching] and is baptized shall be saved; but he that believeth not shall be condemned. And these signs shall follow them that believe: in My name they shall cast out devils.… But they [the eleven] going forth, preached everywhere: the Lord working withal, and confirming the word with signs that followed” (16:15–20).

(c) The third Evangelist, St. Luke, draws attention to the mission to “preach,” but afterwards lays special stress on its principal act—the authentic witnessing—and points to the Holy Ghost, of Whom the human witnesses are the mouthpiece, as the guarantee of the infallibility of the testimony. “Thus it is written, and it behoved Christ to suffer, and to rise again from the dead on the third day; and that penance and the remission of sins should be preached in His name unto all nations, beginning at Jerusalem. And you are witnesses of these things, and I send the promise of My Father upon you” (24:46–49). “You shall receive the power of the Holy Ghost coming upon you, and you shall be witnesses unto Me in Jerusalem and in all Judea and Samaria, and even to the uttermost part of the earth” (Acts 1:8).

(d) Whilst the synoptic Gospels chiefly describe the universal propagation and first diffusion of the doctrine of Christ, St. John, the fourth Evangelist, points out especially the unity, conservation, and application of the doctrine. He narrates, as the last act of our Lord, the appointment of a permanent visible Head of the Church. St. Peter is chosen to take the place of Christ, with power to feed mankind with the bread of doctrine (21:15–17), and to lead them in the light of truth. The apostolic organism thus receives a firm centre and a permanent consistency. The abiding and invisible assistance of Christ announced in St. Matthew to the members of the Apostolate is here visibly embodied in His supreme representative to whom