“The reach of vibrations is according to the fineness of the plane of their starting-point. To speak more plainly, the word uttered by the lips can only reach the ears of the hearer; but the thought proceeding from the mind reaches far, shooting from mind to mind. The vibrations of mind are much stronger than those of words. The earnest feelings of one heart can pierce the heart of another; they speak in the silence, spreading out into the sphere, so that the very atmosphere of a person's presence proclaims his thoughts and emotions. The vibrations of the soul are the most powerful and far-reaching, they run like an electric current from soul to soul.”

Hazrat Inayat Khan, The Mysticism of Sound and Music