It describes the concept of 'self-concept' and a, I guess, pseudo-treatment for addressing deep-set neurosis/anxiety caused by having one that is a little malformed. This post led (in a sort of roundabout way, hitting at a good time in my life and while I was already thinking in the direction of fixing this problem) to a sort of self-therapy where I snapped out of an unhealthy mental state I had been in for something like a decade. Probably good therapy could have had the same effect but I've always had trouble with that, and the ideas here led to a non-unsuccessful self-therapy. My issue was not at all related to the one he describes in the post, but the approach seemed to work anyway.
https://kajsotala.fi/2017/07/how-i-found-fixed-the-root-prob...