102 The Church preaches and inculcates obedience and respect for earthly authority which derives from God its whole origin and holds to the teaching of her Divine Master Who said: "Render therefore to Caesar the things that are Caesar's" ( Saint Matthew xxii. 21); she has no desire to usurp, and sings in the liturgy: "He takes away no earthly realms who gives us the celestial" (hymn for Feast of Epiphany). She does not suppress human energies but lifts them up to all that is noble and generous and forms characters which do not compromise with conscience. Nor has she who civilizes the nations ever retarded the civil progress of mankind, at which on the contrary she is pleased and glad with a mother's pride. The end of her activity was admirably expressed by the Angels over the cradle of the Word Incarnate, when they sang of glory to God and announced peace to men of good will: "Glory to God in the highest; and on earth peace to men of good will" ( Saint Luke ii. 14).
Source: Summi Pontificatus (Vatican.va)