The universal belief in evil spirits became a powerful engine for the advancement of the church. By its use all those who were inimical to the church could be put out of the way as comrades of devils, and, furthermore, the theory was advanced that only by the exorcisms of the church could man be protected from malevolent powers. Holy water, signs of the cross, repetitions of the name of Mary had full power to annul all the machinations of the demons, but only in the hands of the true believers was this efficacious. To preserve one from the dangers of demonic spite, absolute orthodoxy was essential, and thus a great premium was imposed upon strict adherence to the church. Thus was gross superstition a most powerful factor in the growth and spread of Christianity. According to Lecky: "There was scarcely a village or a church that had not, at some time, been the scene of supernatural interposition. The powers of light and the powers of darkness were regarded as visibly struggling for the mastery. Saintly miracles, supernatural cures, startling judgments, visions, prophecies, and prodigies of every order, attested the activity of the one, while witchcraft and magic, with all their attendant horrors, were the visible manifestations of the other.... Tens of thousands of victims perished by the most agonizing and protracted torments, without exciting the slightest compassion.... Nations that were separated by position, by interests, and by character, on this question were united." And the germ of all this evil lay in the very foundation of Christianity--the faith held in supernatural agencies.