The human soul
“The human soul, when matured, ennobled, and spiritualized, approaches the heavenly status in that it comes near to being an entity intervening between the material and the spiritual, the material self and the divine spirit. The evolving soul of a human being is difficult of description and more difficult of demonstration because it is not discoverable by the methods of either material investigation or spiritual proving. Material science cannot demonstrate the existence of a soul, neither can pure spirit-testing. Notwithstanding the failure of both material science and spiritual standards to discover the existence of the human soul, every morally conscious mortal knows of the existence of his soul as a real and actual personal experience.”