I was reading last week the first chapters of a book about meditation.
Although I was really wary of the appearance of any esoteric content at the turn of every next page, I found myself realizing how some concepts are not inconsistent with Objectivism.
The main one is about "focusing".
For many promoters of mediation, meditation is about placing yourself as an observer of your thoughts, so that you can realize that you are not your thoughts. As an observer and master of your thoughts, you can command your mind, use it as a tool.
You can be concious about your own existence, without havi