Their way of contemplation sets the heart in rhythm, which makes even the circulation of the blood regular, and the pulsation and the whole mechanism of the body become rhythmic. When the mind is also set in rhythm by its awakened response to tone, the Sufi's whole being becomes musical. This is why the Sufi can harmonize with each and all. Music makes all things in the world living to him and makes him alive to all things, and he begins to realize how life is dead to many in the world, and how many are dead to life.