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The American Church Dictionary and Cycopedia
The word "heresy" is derived from a Greek word, meaning "a choice," and is applied to doctrines or beliefs that are contrary to Divine Revelation as witnessed to by the Holy Catholic Church. A "Heretic" is one who prefers such false teaching to "the Faith once delivered to the Saints." Concerning such St. Paul says, "A man that is an heretic, after the first and second admonition, reject" (St. Titus 3:10). The Church regards the true Faith as of such vital importance to her life and to the life of each individual soul, she bids us to pray in the Litany, "From all false doctrine, heresy, and schism, Good Lord, deliver us."
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Miller, William James. Entry for 'Heresy. Heretic'. The American Church Dictionary and Cyclopedia. https://www.studylight.org/dictionaries/eng/acd/h/heresy-heretic.html. 1901.