Chapter 1 — Preface to the Roman Catechism
Section 9. For - to say nothing of those illustrious States which heretofore professed, in piety and holiness, the true Catholic faith transmitted to them by their ancestors, but are now gone astray wandering from the paths of truth and openly declaring that their best claims to piety are founded on a total abandonment of the faith of their fathers - there is no region, however remote, no place, however securely guarded, no corner of Christendom, into which this pestilence has not sought secretly to insinuate itself.