The conscious mind reasons and the other one does not, and Mlmsecret builds five posts on that single distinction. The argument runs that anything the reasoning part accepts gets handed down and acted on without further question, which is why an idea you half believe can shape a year.
The happiness post applies it directly. If feeling is triggered below the level of argument, and everything reaching that level arrives through the five senses, then managing what you look at and listen to matters more than deciding to feel better.
The training post is the sceptical one. It argues that people can be pushed only so far before the pushing becomes the problem, and that relying on a system to do the work is the most common reason nothing happens.
Five posts, all working the same idea from different sides. Nothing is sourced, so treat it as one person's model rather than as science. If you have never thought about it this way, start with the first one and read them in order.