In the case of souls we may also realize that the manifestation of such a variety among them is an illusion too. One forgets that all the various faces and endless forms of human beings belong to one Spirit and are the manifestations of that one Spirit. When one begins to understand the theory of color and sound, one can begin to understand that too. For instance, what is sound? The different notes are the various degrees of breath: human breath, or the echo coming from a vessel, an instrument, or a bell, for that also is breath the breath of human beings as well as the breath of objects. From the one breath many sounds manifest; so that takes one back again to the idea of unity. All this variety of colors and forms and sounds proceeds from one single source.