We distinguish five external senses because we know the five organs of sense. In reality there is one sense. It is that sense which, through these five different organs, experiences life and distinguishes life in five different forms. And so all that is audible and all that is visible is one and the same. It is this which is called in Sanskrit Purusha and Prakriti. In the terms of the Sufis this is known as Dhat (zat) and Sifat. The manifestation of this, the outer appearance, is called Sifat. It is in the manifestation of Sifat that one sees the distinction, or the difference between that which is visible and that which is audible. In their real aspect of being they are one and the same. That plane of existence where they are one and the same is called Dhat (zat), according to that knowledge of the inner existence of the Sufi mystics, in which one sees the source and goal of all things.