His books are definitely interesting. Long time ago I remember experimenting with the Berhatiah. In the Berhatiah there is something called the "conjuration oath", that is supposed to be read for 28? days from 11 to 1111x a day. The oath must be unlocked and once it is "unlocked", just reading it a few times (7x?) is supposed to give you great benefits.
I could not find the time to read it that many times per day, a bit hard to spam it 999 or 1111x at once, it's not that long but takes like 2-3 minutes to read it through.
I did spam the oath in more moderate numbers and there were some effects. Spiritual effects, and some of my requests got fulfilled. The text definitely has some power in there.
I think he has written more books, I can't remember the others though, something about magic squares?