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15. From this poisoned source of indifferentism flows that false and absurd, or rather extravagant, maxim that liberty of conscience should be established and guaranteed to each man - a most contagious error, to which leads that absolute and unbridled liberty of opinion which for the ruin of Church and State spreads over the world, and which some men, by unbridled impudence, fear not to represent and advantageous to the Church. "And what more certain death for souls," says Saint Augustine, "than the liberty of error!" On beholding them thus, indeed, take away from men every rein able to restrain them in the paths of truth, hurried us they already to ruin by a nature inclined to evil, we may say in truth that there yawns that pit of the abyss, from which Saint John beheld ascending a smoke that obscured the sun, and locusts to lay waste the earth. Thence, in fact, the instability of minds; thence, the ever increasing corruption of the young; thence, in the people, the contempt of sacred rights and holiest laws and things; thence, in a word, the saddest scourge that can ravage States, since experiences attests, and the remotest antiquity teaches, that cities powerful in wealth, dominion, and glory perished by this sole evil - the unbridled liberty of opinions, the license of public discourse, the passion for changes.
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