50 The application of this principle likewise safeguards the dignity of citizens. Their obedience to civil authorities is never an obedience paid to them as men. It is in reality an act of homage paid to God, the provident Creator of the universe, who has decreed that men's dealings with one another be regulated in accordance with that order which He Himself has established. And we men do not demean ourselves in showing due reverence to God. On the contrary, we are lifted up and ennobled in spirit, for to serve God is to reign.(33)
Source: Pacem in Terris (Vatican.va)