Find accurate definitions of over 5,000 Catholic terms and phrases (including abbreviations). Based on Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.
Classical source, often used of biblical passages that are most cited by the Church's teaching authority as the basis in revelation for certain Catholic doctrines. Thus "You are Peter," addressed to Simon Peter by Christ, is a locus classicus for the papal primacy (Matthew 16:18).