Belts, I've had a quick look at the 1983 year book (from the dvd which don't give page numbers) and it might be this quote
"From Chile’s report we read: “A special pioneer making a return visit asked the lady what book teaches us the will of God. ‘The Watchtower, of course,’ she said. Our sister proceeded to explain that it was, rather, the Bible. ‘Yes, but what would I do with my recently obtained Bible if I did not use The Watchtower to understand it?’—Acts 8:31.”