9 It is, then, right to look on religion, and whatever is connected by any particular bond with it, as belonging to a higher order. Hence, in the vicissitudes of human affairs, and even in the very revolutions in States, religion, which is the supreme good, should remain intact; for it embraces all times and all places. Men of opposite parties, though differing in all else, should be agreed unanimously in this: that in the State the Catholic religion should be preserved in all its integrity. To this noble and indispensable aim, all who love the Catholic religion ought, as if bound by a compact, to direct all their efforts; they should be somewhat silent about their various political opinions, which they are, however, at perfect liberty to ventilate in their proper place: for the Church is far from condemning such matters, when they are not opposed to religion or justice; apart and removed from all the turmoil of strife, she carries on her work of fostering the common weal, and of cherishing all men with the love of a mother, those particularly whose faith and piety are greatest.
Source: Cum Multa (Vatican.va)