18 There cannot be the slightest doubt of the fact that the Mexican hierarchy have unitedly used every means within their power to defend the liberty and good name of the Church. In the first place, they indited a joint pastoral letter to their people in which they proved beyond cavil that the clergy had always acted toward the rulers of the Republic motivated by a love for peace, with prudence and in all patience; that they had even suffered, in a spirit of almost too much tolerance, laws which were unjust; they admonished the faithful, outlining the divine constitution of the Church, that they, too, must always persevere in their religion, in such a way that they shall "obey God rather than men" ( Acts v, 19) on every occasion when anyone tries to impose on them laws which are no less contrary to the very idea of law and do not merit the name of law, as they are inimical to the constitution and existence itself of the Church.
Source: Iniquis Afflictisque (Vatican.va)