"The part of the Pastors who, in the midst of the most cunning contradictions, the most unfounded pretensions, the most illegitimate usurpations, [...] would oppose an invincible resistance and alone would escape seduction, this clergy, I say, would exclusively compose the true Church, and would consequently have the marks and qualities of the true Church. [...] The Church must always subsist as Jesus Christ established it, and consequently always maintain, despite all attacks, the essential form of its government, but this perpetuity is no longer found in the part of the Pastors who do not resist innovations, therefore it must be sought only in the part that rejects them, that alone will therefore be the true Church."

Mgr Maur Cappellari (future Pope Gregory XVI), Triumph of the Holy See and the Church or Modern Innovators Combated by Their Own Weapons (1833).