Au Milieu Des Sollicitudes §19

¹⁹ Consequently, when new governments representing this immutable power are constituted, their acceptance is not only permissible but even obligatory, being imposed by the need of the social good which has made and which upholds them. This is all the more imperative because an insurrection stirs up hatred among citizens, provokes civil war, and may throw a nation into chaos and anarchy, and this great duty of respect and dependence will endure as Tong as the exigencies of the common good shall demand it, since this good is, after God, the first sand last law in society.