This principle is at the heart of Chinese Medicine. Energy manifests itself in different concentrations. The densest expression of energy is the material world: trees; grass, rocks, water, air and so on.
This means that your body is also a form of energy. But so are your emotions and your thoughts, albeit slightly less dense forms of energy. The lightest and thinnest level of energy is the spiritual world.
Bibliography: Rose Elliot and Carlo de Paoli: Kitchen Pharmacy, A Book of Healing Remedies for Everyone, London, 1998 (p. 17).
Between your soul and your spirit lies consciousness.
Bibliography: The Nag Hammadi Library, The Gospel of Maria Magdalena.
if he does turn out to exist has absolutely no reason for doing so. He is his own reason for being.