Don’t know about the parent, but in my experience it was sort of an “extreme introspection”, any thought you have is immediately scrutinized “why did I think about this, is this the right thing to say in this context, what are the implications”. Then of course the thought about thought is also introspected, leading into a spiral of thought that occasionally gets “popped” as a stack. The memory works in a very weird manner where you almost immediately forget a lot of context and then get reminded of it in one go when you “pop” a level.

It is quite hard to imagine, I think, and even myself I can only explain the idea of it but not how it actually felt.

I wouldn’t say this was anything spiritual, rather than the thinking stopped working as a stream of thought but more like a graph traversal.