Chapter 1 — Preface to the Roman Catechism
Section 7. Need of an Authoritative Catholic Catechism — But while the preaching of the divine Word should never be interrupted in the Church, surely in these, our days, it becomes necessary to labour with more than ordinary zeal and piety to nourish and strengthen the faithful with sound and wholesome doctrine, as with the food of life. For false prophets have gone forth into the world, to corrupt the minds of the faithful with various and strange doctrines, of whom the Lord has said: I did not send prophets, yet they ran; I spoke not to them, yet they prophesied.