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6 to make use of this power when the salvation of souls calls for its exercise. Bad literature is one of the worst enemies of mankind. The Church can never allow it to corrupt the hearts of her children or to undermine the foundation of their faith, without at least raising a warning voice.

How great are the precautions the civil authorities take in case of an epidemic; yet, no matter how seriously the precautions hamper traffic and trade, we find them reasonable. We should even censure our executive and legislative officers if they omitted to take proper precautions. But, says Pope Leo, in the Constitution Officiorum ac munerum, nothing can be conceived more pernicious, more apt to defile souls than uncurbed license in the writing and disseminating of bad books. "Therefore," he continues, "the Church, whose office it is to watch over the integrity of faith and morals, has ever striven, as far as in her power lay, to restrain the faithful from the reading of bad books as from a deadly poison."