See this worth-it ebook:

See also the videos included in the playlists Talks by Bishop Athanasius Schneider and About: Crises in the Church; and the following texts and media (both free and worth-it) relating to contemporary errors:

On the Feast of St. Athanasius in the Latin Church. For other texts and ebooks, you may access the List of Free eBooks (Arranged by Title), the List of Free eBooks (Grouped by Subject), the List of Worth-It Catholic Books & eBooks, and the main page of the Catholic eBooks Project.

“From that time onwards Jesus began to make it known to his disciples that he… must be put to death, and rise again on the third day. Whereupon Peter… began remonstrating with him; Never, Lord, he said; no such thing shall befall thee. At which he turned round and said to Peter, Back, Satan; thou art a stone in my path; for these thoughts of thine are man’s, not God’s…” (St. Matthew xvi, 13-19,21-24)

“But though we, or an Angel from heaven, preach a gospel to you besides that which we have preached to you, let him be anathema… For I give you to understand, brethren, that the gospel which was preached by me is not according to man… but by the revelation of Jesus Christ.” (Galatians i, 8, 11-12)

“[K]eep that which is committed to thy trust, avoiding the profane novelties of words and oppositions of knowledge falsely so called. Which some promising, have erred concerning the faith.” (I Timothy vi, 20-21)

“The time will surely come, when men will grow tired of sound doctrine, always itching to hear something fresh; and so they will provide themselves with a continuous succession of new teachers, as the whim takes them, turning a deaf ear to the truth, bestowing their attention on fables instead. It is for thee to be on the watch, to accept every hardship, to employ thyself in preaching the gospel, and perform every duty of thy office, keeping a sober mind.” (II Timothy iv, 3-5)

“Do not forget those who have had charge of you, and preached God’s word to you; contemplate the happy issue of the life they lived, and imitate their faith. What Jesus Christ was yesterday, and is to-day, he remains for ever. Do not be carried aside from your course by a maze of new doctrines” (Hebrews xiii, 7-9)

“Dearly beloved, taking all care to write to you concerning your common salvation, I was under a necessity to write to you: to beseech you to contend earnestly for the faith once delivered to the saints.” (St. Jude i, 3)