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Modern man listens more willingly to witnesses than to teachers, and if he does listen to teachers, it is because they are witnesses.

Catholic Church. Pope (1963-1978 : Paul VI), Pope Paul VI (1976). “On evangelization in the modern world: Apostolic exhortation Evangelii nuntiandi, December 8, 1975”
Modern man listens more willingly to witnesses than to teachers, and if he does listen to teachers, it is because they are witnesses.