This is from Swami Ramdas’s book “Inward Journey.”

Be a witness to all movements. Detach yourself from them and become the observer of them; then you will realize that you are the eternal witness and the body is not yourself. Identification with the body will go and witness-consciousness will be attained. Mostly you can practice it when you are in meditation. When you are active and moving about, it is difficult to maintain that consciousness. Many rules have to be observed for control of mind; observance of silence is one of them. Who is observing silence? Let us try to find out. Sit silent, detach yourself from the mind and watch its activities. The watcher is the real you – the Self Immortal.