I'd recommend to start with Plato and do some research about who he really was. The Plato's wikipedia page is a good example of what I'm talking about: lots of attention to insignificant details and an attempt to present Plato as some kind of "inventor of dialogue techniques."

To be honest, you are not writing clearly, and this raises my crank/quack alarms. If you have a concrete text that discusses this plainly, even if it's a full book, I'd be glad to hear it.

Just saying that it's some mystery, some forbidden secret knowledge, which mere mortals don't understand, is not convincing.

I have never heard of the phrase "the inner side of things". If this has a meaning, surely someone has written about it.