Like all the fomenters of heresy and schism, they make false boast of having kept the ancient Catholic faith while they are overturning the principal foundation of the Faith and of Catholic doctrine. They certainly recognize in Scripture and Tradition the source of Divine Revelation, but they refuse to listen to the ever-living magisterium of the Church.

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Bld. Pope Pius IX

Letter Inter Gravissimas

to the Episcopal Assembly of Fulva