Te natiónum Præsides
Honore tollant publico,
Colant magistri, júdices,
Leges et artes exprimant.

Verúmtamen ejusmodi regnum præcipuo quodam modo et spirituale esse et ad spirituália pertinére, cum ea, quæ ex Bibliis supra protulimus, verba planíssime ostendant, tum Christus Dóminus sua agéndi ratióne confírmat. Síquidem, non una data occasióne, cum Judæi, immo vel ipsi Apóstoli, per errórem censérent, fore ut Messías pópulum in libertátem vindicáret regnumque Israël restitúret, vanam ipse opiniónem ac spem adímere et convellere ; rex a circumfusa admirántium multitúdine renuntiándus, et nomen et honórem fugiéndo latendóque detrectáre ; coram Præside romano edicere, regnum suum « de hoc mundo » non esse. Quod quidem regnum tale in evangéliis propónitur, in quod hómines pœniténtiam agéndo íngredi vero nequeant nisi per fidem et baptismum, qui etsi est ritus externus, interiórem tamen regeneratiónem signíficat atque efficit ; oppónitur unice regno Sátanæ et potestáti tenebrárum, et ab ásseclis postulat, non solum ut, abalienáto a divítiis rebusque terrenis animo, morum præferant lenitátem et esuriant sitiantque justítiam, sed étiam ut semet ipsos ábnegent et crucem suam tollant. Cum autem Christus et Ecclésiam Redémptor sánguine suo acquisíverit et Sacérdos se ipse pro peccátis hóstiam obtulerit perpetuoque offerat, cui non videátur regium ipsum munus utriusque illíus natúram múneris indúere ac participare? Turpiter, ceteróquin, erret, qui a Christo hómine rerum civílium quarumlibet impérium abjudicet, cum is a Patre jus in res creatas absolutíssimum sic obtineat, ut ómnia in suo arbitrio sint pósita. Itaque auctoritate Nostra apostolica, festum Dómini Nostri Jesu Christi Regis institúimus, quotannis, postremo mensis Octóbris dominico die, qui scílicet Omnium Sanctórum celebritátem proxime antecedit, ubíque terrárum agéndum. Item præcípimus, ut eo ipso die generis humani Sacratíssimo Cordi Jesu dedicátio quotannis renovétur.

But, nevertheless, a kingdom such as this hath a special character, namely, that it is a spiritual kingdom, for it hath spiritual ends and purposes. The words quoted above from the Bible clearly indicate this, and the Lord Christ hath confirmed the same by his actions. On more than one occasion when the Jews―yea, when even the Apostles themselves―falsely imagined that the Messiah would presently free his people from Roman domination, and restore the Kingdom of Israel, he both dispelled and destroyed that fond hope. For he disclaimed the title of King when it was pressed upon him by the admiring multitude which thronged him ; he refused both the name and the honour by fleeing from them and concealing himself ; and he declared in the presence of the Roman Governour : My kingdom is not of this world. According to the Gospels it is a kingdom whose citizenship is prepared for by repentance, and bestowed by Baptism through faith. Although the latter is an outward rite, it doth both signify and produce an inward regeneration. Furthermore, this kingdom hath been raised up in direct opposition to the kingdom of Satan and the powers of darkness. Citizenship therein demandeth detachment from riches and worldly affairs, discipline of character, and hunger and thirst after righteousness ; and even more than this, that every citizen thereof is to deny himself, and take up his Cross. But since Christ as Redeemer hath purchased the Church with his own blood, and as Priest hath offered himself as a sacrifice for sin, which offering abideth forever, is it not evident that as King he is both our Redeemer and Priest? On the other hand, it is a wicked error to deny to Christ as Man the authority over civil affairs, since he hath from the Father such complete jurisdiction over created things that he could say : All power is given unto me in heaven and earth. Therefore, by our apostolic authority, we appoint the feast of Our Lord Jesus Christ the King, which same is to be observed annually throughout the entire world, on the last Lord’s day in the month of October, that is to say, on the Sunday next before All Saints Day ; and likewise we enjoin, that the dedication of the human race to the Most Sacred Heart of Jesus be annually renewed upon that selfsame day.

The above passages from Quas primas were taken from breviary.net.

We also read in Quas primas (November 12, 1925):

Thus the empire of our Redeemer embraces all men. To use the words of Our immortal predecessor, Pope Leo XIII: “His empire includes not only Catholic nations, not only baptized persons who, though of right belonging to the Church, have been led astray by error, or have been cut off from her by schism, but also all those who are outside the Christian faith; so that truly the whole of mankind is subject to the power of Jesus Christ.” Nor is there any difference in this matter between the individual and the family or the State; for all men, whether collectively or individually, are under the dominion of Christ. In him is the salvation of the individual, in him is the salvation of society. “Neither is there salvation in any other, for there is no other name under heaven given to men whereby we must be saved.” He is the author of happiness and true prosperity for every man and for every nation. “For a nation is happy when its citizens are happy. What else is a nation but a number of men living in concord?” If, therefore, the rulers of nations wish to preserve their authority, to promote and increase the prosperity of their countries, they will not neglect the public duty of reverence and obedience to the rule of Christ. What We said at the beginning of Our Pontificate concerning the decline of public authority, and the lack of respect for the same, is equally true at the present day. “With God and Jesus Christ,” we said, “excluded from political life, with authority derived not from God but from man, the very basis of that authority has been taken away, because the chief reason of the distinction between ruler and subject has been eliminated. The result is that human society is tottering to its fall, because it has no longer a secure and solid foundation.”