The person, however, must carefully choose the books they read and will be discipled unto, and must read with discernment and care, and must not adopt everything they read. For there are books, even by renowned authors, that contain unsound information. And not all books are without error.
Therefore, the reader should place in front of themself the saying of St. Paul the Apostle, “Test all things; hold fast what is good. Abstain from every form of evil;” and the saying of St. John also, “Do not believe every spirit, but test the spirits, whether they are of God.”
—H.H. Pope Shenouda III, Come, Follow Me