24 Nor can We praise enough the courageous faithful of Mexico who have understood only too well how important it is for them that a Catholic nation in matters so serious and holy as the worship of God, the liberty of the Church, and the eternal salvation of souls should not depend upon the arbitrary will and audacious acts of a few men, but should be governed under the mercy of God only by laws which are just, which are conformable to natural, divine, and ecclesiastical law.
Source: Iniquis Afflictisque (Vatican.va)