Book excerpt: The office divinely committed to Us of feeding the Lord’s flock has especially this duty assigned to it by Christ, namely, to guard with the greatest vigilance the deposit of the faith delivered to the saints, rejecting the profane novelties of words and oppositions of knowledge falsely so called. There has never been a time when this watchfulness of the supreme pastor was not necessary to the Catholic body; for, owing to the efforts of the enemy of the human race, there have never been lacking “men speaking perverse things” (Acts xx. 30), “vain talkers and seducers” (Tit. i. 10), “erring and driving into error” (2 Tim. iii. 13). Aeterna Press