43 Secondly, action may relate to private and domestic matters, or to matters public. As to private affairs, the first duty is to conform life and conduct to the gospel precepts, and to refuse to shrink from this duty when Christian virtue demands some sacrifice slightly more difficult to make. All, moreover, are bound to love the Church as their common mother, to obey her laws, promote her honour, defend her rights, and to endeavour to make her respected and loved by those over whom they have authority. It is also of great moment to the public welfare to take a prudent part in the business of municipal administration, and to endeavour above all to introduce effectual measures, so that, as becomes a Christian people, public provision may be made for the instruction of youth in religion and true morality. Upon these things the well-being of every State greatly depends.
Source: Immortale Dei (Vatican.va)