"This kingdom is spiritual and is concerned with spiritual things. That this is so the above quotations from Scripture amply prove, and Christ by his own action confirms it. On many occasions, when the Jews and even the Apostles wrongly supposed that the Messiah would restore the liberties and the kingdom of Israel, he repelled and denied such a suggestion. When the populace thronged around him in admiration and would have acclaimed him King, he shrank from the honor and sought safety in flight. Before the Roman magistrate he declared that his kingdom was not of this world. The gospels present this kingdom as one which men prepare to enter by penance, and cannot actually enter except by faith and by baptism, which, though an external rite, signifies and produces an interior regeneration. This kingdom is opposed to none other than to that of Satan and to the power of darkness. It demands of its subjects a spirit of detachment from riches and earthly things, and a spirit of gentleness. They must hunger and thirst after justice, and more than this, they must deny themselves and carry the cross. Christ as our Redeemer purchased the Church at the price of his own blood; as priest he offered himself, and continues to offer himself as a victim for our sins. Is it not evident, then, that his kingly dignity partakes in a manner of both these offices? It would be a grave error, on the other hand, to say that Christ has no authority whatever in civil affairs, since, by virtue of the absolute empire over all creatures committed to him by the Father, all things are in his power. Therefore by Our Apostolic Authority We institute the Feast of the Kingship of Our Lord Jesus Christ to be observed yearly throughout the whole world on the last Sunday of the month of October - the Sunday, that is, which immediately precedes the Feast of All Saints. We further ordain that the dedication of mankind to the Sacred Heart of Jesus, to be renewed yearly."
-Sixth Lesson of Mattins, Feast of Christ the King