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I agree Radio Replies is a great idea, and I think I recall seeing them advertised as available on audio, either tapes or CDs.
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But like stated above, the sound copy might be more useful instead of a book. Although for some a book is preferred. Maybe both!
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Keep the Faith has a lot of cassette tapes that would be wonderful.
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They have recordings of Bishop Sheen who was pretty persuasive with Protestants, at least at a basic level.
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Sometimes getting them to take the first step -- recognizing the authority of the Catholic Church -- is the hardest.
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Protestants already have an abiding respect for the Church, but they've misplaced the value of authority.
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I knew a fallen-away Catholic who became aggressively Protestant, and his major hang-up was AUTHORITY. He never failed to challenge me whenever I mentioned the infallibility of the Pope or dogmatic definitions or the Church Magisterium (teaching office).
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To him, HE was the one who was infallible, and so is every Protestant! So I asked him how can two Protestants who disagree on some point both be infallible. He would dance all around that question and never had a solid answer. He seemed to think it was funny.
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Some of the best Keep the Faith tapes I have heard are old recordings of Catholic priests who were missionaries in China.
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One that comes to mind is Fr. Aidan McGrath, an Irish priest from Dublin who had never heard of the Legion of Mary until he went to China. He said they tried to give him credit for starting presidia in China and he denied it, saying with a lovely Irish brogue, "The Legion spreads itself! I had nothing to do with it. You couldn't stop it!" -- That was a recording made in Australia in 1957 after he had been expelled from China after surviving about 7 years in prison surrounded by other priests who went mad or died of strange ailments in prison. It was prayer alone that got him through and he has no idea how that was but it was. Standing for 3 days in chains unable to sneeze or cough or close his eyes, longing to faint but couldn't, being asked stupid questions, told he must confess to a crime he no more committed than you or I did.
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It seems to me that a Protestant could hardly ignore the power of Mary's grace evidenced by the descriptions of these good priests.
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Communism has provided for us a tremendous historical evidence of the power of grace -- see what's happening in Russia today.
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