Relax, and sit or lie in a quiet place. Don’t attempt to control the thinking process by trying to think certain thoughts and not think others. Instead, let your mind think about whatever it may. Now watch your mind and become aware of how you are actually aloof from the thinking process. Say to yourself, “I am the silent witness. I make no effort to think, but thoughts come automatically. I am watching thoughts flow through my mind, but I am aloof from them. I am the silent witness to my mind’s activities.” In this way, you’ll be able to experience that you are separate from the mind.
You can also watch the passing emotions, feelings, desires, fears, and so on as they rise to the surface of the mind and then pass away. The stream of mindstuff thus flows along, and you are the viewer of it. Just as a person sits by an ever-moving stream, so you, the self, sit by the stream of mindstuff. Just as a stream may be very clear or very polluted, so the stream of mindstuff may be very clear or very polluted. In either case, you are the witness of that stream—not the stream itself.
You may not be content to watch the stream of mindstuff flow freely, but instead may try to control it, redirect it, or stop it completely. But the very fact that you can try to redirect or control your mind, combined with the fact that it is so difficult to succeed in the endeavor, further shows that you, the self, are not the mind or stream of mindstuff.