Pope Leo XIII on Christ the King
3. This world-wide and solemn testimony of allegiance and piety is especially appropriate to Jesus Christ, who is the Head and Supreme Lord of the race. His empire extends not only over Catholic nations and those who, having been duly washed in the waters of holy baptism, belong of right to the Church, although erroneous opinions keep them astray, or dissent from her teaching cuts them off from her care; it comprises also all those who are deprived of the Christian faith, so that the whole human race is most truly under the power of Jesus Christ. For He who is the Only-begotten Son of God the Father, having the same substance with Him and being the brightness of His glory and the figure of His substance (Hebrews i., 3) necessarily has everything in common with the Father, and therefore sovereign power over all things. This is why the Son of God thus speaks of Himself through the Prophet: “But I am appointed king by him over Sion, his holy mountain. . . The Lord said to me, Thou art my son, this day have I begotten thee. Ask of me and I will give thee the Gentiles for thy inheritance and the utmost parts of the earth for thy possession” (Psalm, ii.). By these words He declares that He has power from God over the whole Church, which is signified by Mount Sion, and also over the rest of the world to its uttermost ends. On what foundation this sovereign power rests is made sufficiently plain by the words, “Thou art My Son.” For by the very fact that He is the Son of the King of all, He is also the heir of all His Father’s power: hence the words-“I will give thee the Gentiles for thy inheritance,” which are similar to those used by Paul the Apostle, “whom he bath appointed heir of all things” (Hebrews i., 2).
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.
5. But this is not all. Christ reigns nor only by natural right as the Son of God, but also by a right that He has acquired. For He it was who snatched us “from the power of darkness” (Colossians i., 13), and “gave Himself for the redemption of all” (I Timothy ii., 6). Therefore not only Catholics, and those who have duly received Christian baptism, but also all men, individually and collectively, have become to Him “a purchased people” (I Peter ii., 9). St. Augustine’s words are therefore to the point when he says: “You ask what price He paid? See what He gave and you will understand how much He paid. The price was the blood of Christ. What could cost so much but the whole world, and all its people? The great price He paid was paid for all” (T. 120 on St. John).
6. How it comes about that infidels themselves are subject to the power and dominion of Jesus Christ is clearly shown by St. Thomas, who gives us the reason and its explanation. For having put the question whether His judicial power extends to all men, and having stated that judicial authority flows naturally from royal authority, he concludes decisively as follows: “All things are subject to Christ as far as His power is concerned, although they are not all subject to Him in the exercise of that power” (3a., p., q. 59, a. 4). This sovereign power of Christ over men is exercised by truth, justice, and above all, by charity.