The priest at the prior I attended had a fear, and almost jealous possesiveness, about his laity reading or listening to any other teachings. As a result, there was an unwritten rule that one did not read any other books by spiritual or Buddhist teachers. It was conveyed by him dismissing any discussion about other teachers and their teachings in an elitist, scornful way.
I once recall asking a question about a passage on a precept from Robert Aiken's, "The Mind of Clover," and my teacher refused to answer the question, about the teaching, by replying "I don't know who that is." Another time I mentioned going to hear Ram Das speak and my teacher again scoffed, "I don't know who that is" and became very quiet.
Another time I brought a friend to an introductory retreat where she mentioned Thich Naht Hahn during the question and answer period. The prior responded by saying something to the effect that Hahn is not an authentic Buddhist. Afterward, my friend asked me what he had against Hahn and I felt almost embarrassed.
Unfortunately, for a long time, I also embraced the idea that OBC buddhism was the only real Buddhism. When I took a job in another city without an OBC priory, I was afraid of attending other groups thinking that their teachings would be sub par. And when I finally did, I had a lot of fear and judgments--primarily of the nature that these teachings aren't as good as the OBC's.
I'm happy to say that some years later, I've realized that there are good teachers and teachings everywhere. Whether they seem true, authentic or helpful is something I can now trust myself to judge... I don't need to be fearful anymore.
I'm also pleased to see that the OBC is opening up a little too. I heard them quoting Robert Aiken recently, which made me smile. And ten years after the fact, the priory I went to is watching Ram Das video for movie night.
Unfortunately, I think RMJK passed on underlying feeling of paranoia, mistrust, and need to control and thankfully the monks are finally starting to outgrow and question that fear. It's nice to see them learning to "trust and let go a little" too.