10 But, if the laws of the State are manifestly at variance with the divine law, containing enactments hurtful to the Church, or conveying injunctions adverse to the duties imposed by religion, or if they violate in the person of the supreme Pontiff the authority of Jesus Christ, then, truly, to resist becomes a positive duty, to obey, a crime; a crime, moreover, combined with misdemeanor against the State itself, inasmuch as every offense leveled against religion is also a sin against the State. Here anew it becomes evident how unjust is the reproach of sedition; for the obedience due to rulers and legislators is not refused, but there is a deviation from their will in those precepts only which they have no power to enjoin. Commands that are issued adversely to the honor due to God, and hence are beyond the scope of justice, must be looked upon as anything rather than laws. You are fully aware, venerable brothers, that this is the very contention of the Apostle St. Paul, who, in writing to Titus, after reminding Christians that they are "to be subject to princes and powers, and to obey at a word," at once adds: "And to be ready to every good work."(7) Thereby he openly declares that, if laws of men contain injunctions contrary to the eternal law of God, it is right not to obey them. In like manner, the Prince of the Apostles gave this courageous and sublime answer to those who would have deprived him of the liberty of preaching the Gospel: "If it be just in the sight of God to hear you rather than God, judge ye, for we cannot but speak the things which we have seen and heard."(8)
Source: Sapientiae Christianae (Vatican.va)