4 But we should now give most special consideration to the declarations made by Jesus Christ, not through the Apostles or the Prophets but by His own words. To the Roman Governor who asked Him, "Art thou a king then?" He answered unhesitatingly, "Thou sayest that I am a king" (John xviii. 37). And the greatness of this power and the boundlessness of His kingdom is still more clearly declared in these words to the Apostles: "All power is given to me in heaven and on earth" (Matthew xxviii., 18). If then all power has been given to Christ it follows of necessity that His empire must be supreme, absolute and independent of the will of any other, so that none is either equal or like unto it: and since it has been given in heaven and on earth it ought to have heaven and earth obedient to it. And verily he has acted on this extraordinary and peculiar right when He commanded His Apostles to preach His doctrine over the earth, to gather all men together into the one body of the Church by the baptism of salvation, and to bind them by laws, which no one could reject without risking his eternal salvation.
Source: Annum Sacrum (Vatican.va)