Chapter 1 — Preface to the Roman Catechism
Section 8. In this work, to such extremes has their impiety, practiced in all the arts of Satan, been carried, that it would seem almost impossible to confine it within any bounds; and did we not rely on the splendid promises of the Saviour, who declared that He had built His Church on so solid a foundation that the gates of hell shall not prevail against it, we should have good reason to fear lest, beset on every side by such a host of enemies and assailed and attacked by so many machinations, it would, in these days, fall to the ground.