St. Irenaeus focuses in this section on the importance of trusting the apostolic deposit of faith. He refers to how the interpretation of the Scriptures was passed to him by his own mentors, who themselves learned it at the feet of the apostles. Irenaeus is not merely passing on some ideas that he has personally found compelling; he is guarding a deposit of teachings that was entrusted to him by apostolic teachers who gave their lives to preserve them.

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