So the point is this: ideas can mess with people's heads, and even if we think that sometimes that's a good thing, that doesn't necessarily mean that it's always a good thing. Sometimes people just misunderstand or get hurt and instead of being challenged and transformed; they hunker down into a more rigid version of the world they were living in anyway. One way to avoid this is to try to control who has access to dangerous ideas. That was easier when Dionysius was writing, when most people couldn't read anyway, and as there were only a few copies of any given book it was pretty straightforward just to keep them all away from the wrong people.
We don't like the idea of keeping books away from people any more, and even if we wanted to, it would probably just end up leaked on the internet (cough cough, Julian Assange). But there's another way of making sure that the Wrong People don't have access to your ideas: make them really difficult to understand. You can do this in several ways: you can build in lots of references to other thinkers, so that before people can read your book, they have to read and understand lots of other books. You can use complicated technical terms to ensure that people have to have a certain degree of knowledge about the subject you're writing on. There are probably more, but my point is this: whether intentionally or unintentionally, a feature of a lot of theology and philosophy books these days is that they are really inaccessible to the uninitiated.
You could read this inaccessibility as elitism: academics think they're better than us so they deliberately keep their ideas out of our reach. But here's a more charitable, Dionysian way of reading the situation. The thing with Dionysius was that he doesn't think that there are people who fundamentally aren't good enough to be allowed to read his books. His worry is about immaturity. Some people just aren't ready to read his work yet … but they could become ready. Some ideas really do require a certain degree of education and maturity: you wouldn't teach quantum physics to someone who had never studied any science at all. You can't just sit down with Hegel and understand him straight away: you have to really work at it, and maybe it's ok to ask people to work hard at understanding what they read.
Have I persuaded you yet?
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