"If unbridled licence of speech and writing be granted to all, nothing will remain sacred and inviolate; even the highest and truest mandates of nature, justly held to be the common and noblest heritage of the human race, will not be spared. Thus, truth being gradually obscured by darkness, pernicious and manifold error, as too often happens, will easily prevail."

Source : Pope Leo XIII (1990). “A Light in the Heavens: Great Encyclical Letters of Pope Leo XIII”, p.108, TAN Books

Pope Leo XIII

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