A very materialistic person has a loud breath, audible to all. The finer a person, the finer is his breath. He hears the sound of his heart: what it speaks, and he hears what the heart of another speaks. This is thought-reading. First he must hear what his own heart says; then he hears what is in the heart of others in their presence and in their absence. We are accustomed to call that which our ears hear sound, but there is also the sound of the mind, of the heart, of the soul.