Excerpt from On the Nature of Human Liberty, 1888:"We must now consider briefly liberty of speech, and liberty of the press. It is hardly necessary to say that there can be no such right as this, if it be not used in moderation, and if it pass beyond the bounds and end of all true liberty. For right is a moral power which -- as We have before said and must again and again repeat -- it is absurd to suppose that nature has accorded indifferently to truth and falsehood, to justice and injustice. Men have a right freely and prudently to propagate throughout the State what things soever are true and honorable, so that as many as possible may possess them; but lying opinions, than which no mental plague is greater, and vices which corrupt the heart and moral life should be diligently repressed by public authority, lest they insidiously work the ruin of the State…
If unbridled license of speech and of writing be granted to all, nothing will remain sacred and inviolate; even the highest and truest mandates of natures, 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. Thus, too, license will gain what liberty loses; for liberty will ever be more free and secure in proportion as license is kept in fuller restraint [bold font and italics added].
For this reason it is plainly the duty of all who teach to banish error from the mind, and by sure safeguards to close the entry to all false convictions.
From all this may be understood the nature and character of that liberty which the followers of liberalism so eagerly advocate and proclaim. On the one hand, they demand for themselves and for the State a license which opens the way to every perversity of opinion; and on the other, they hamper the Church in divers ways, restricting her liberty within narrowest limits, although from her teaching not only is there nothing to be feared, but in every respect very much to be gained.
But, in spite of all this show of tolerance, it very often happens that, while they profess themselves ready to lavish liberty on all in the greatest profusion, they are utterly intolerant toward the Catholic Church, by refusing to allow her the liberty of being herself free.
[A]ny liberty, except that which consists in submission to God and in subjection to His will, is unintelligible. To deny the existence of this authority in God, or to refuse to submit to it, means to act, not as a free man, but as one who treasonably abuses his liberty; and in such a disposition of mind the chief and deadly vice of liberalism essentially consists."
