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.
Source: Annum Sacrum (Vatican.va)