Our mental body is the carrier of our thoughts. Most people seek access to truth through the linear thinking of the rational mind, which is based on the perception of the gross material levels of creation, but creation consists of much more than just the very small spectrum that our senses can perceive.
The conscious, rational mind is actually, among other things, (only) a human tool with the help of which he can create (manifest) his reality. For most people, however, the subconscious mind has largely taken control of thinking and creates their reality based on past experiences or perspectives.
From perception to thought
People gather information from the environment through their senses, which then travels directly into the subconscious mind without any noticeable delay. There, it is then checked to see if there is already information about the corresponding perception. If there is already information from the past there, then the perceived information is filtered (or distorted) by this past information and then ultimately comes into the conscious mind.
Here, the thoughts emerging from the subconscious operate as an almost continuous flow of sound. These thoughts have a strong magnetism and want you to constantly feed them with attention/energy. Most people are caught up in it almost all day without really noticing it, and so the views stored in the subconscious more or less determine life.
The process itself of 'checking' in the subconscious to see whether there is already information about something from the past is in itself useful and not a bad thing, but it can also lead to problems. Here is an example: If, for example, you once had an accident in which you were hit by a red car, then it might be that the view has formed in your subconscious that red cars are dangerous. As a result, whenever the senses perceive a red car, there might be a corresponding negative reaction in the body system.
Furthermore, a problem naturally arises when we identify with the thoughts that arise from the subconscious, as we get a false image of ourselves and creation. As a soul begins to open up more and more to the perspectives of the higher Self in the course of its evolution, the subconscious mind becomes more and more cleansed from old (distorted) perspectives.