the ocean replies that perhaps the soul is nothing but an emergent quality of the interaction of neurons firing in the brain - an epiphenomenon ; that the soul is removed when the mind is removed , that the soul dies when the brain dies ; that the soul is a delicate perfume , formed in the careful mix of identity , emotions , experiences , perspective , knowledge and wisdom ; that the soul is the rainbow that is formed when the light of this world hits the prism of the mind .