Concentration, meditation, and learning to direct the mind according to your own will, prove that you are not your mind. Can the mind control itself, or does it need some higher power to control it? This leads you to realize that you are separate from the mind, otherwise how can you master it? It is you, the real you that is directing the mind. The ability to focus the mind or stop its activities in accordance with your willpower awakens the understanding that you are not your mind, and this is a great step toward self-realization.