55 Where the dependence of human right upon the Divine is denied, where appeal is made only to some insecure idea of a merely human authority, and an autonomy is claimed which rests only upon a utilitarian morality, there human law itself justly forfeits in its more weighty application the moral force which is the essential condition for its acknowledgment and also for its demand of sacrifices.
Source: Summi Pontificatus (Vatican.va)