Many cultures have always recognised an incorporeal or spiritual principle of human life or existence corresponding to the soul. Many believed that this soul has an afterlife. Ancient Greeks–particularly Plato–had a dualist view of reality and the identity of the human being did not derive from the body but from the character of the soul. For Platonists the soul was a spiritual substance akin to the gods and yet part of the changing world. In the late 1960s a scientist set out to explore if a spiritual dimension does exist. Hardy, a Darwinian and self-defined inquiring naturalist, was not of any religious persuasion but he was convinced that our spiritual dimension was in some way linked with the evolutionary process. The Spiritual Nature of Man was based on the first eight years' work of the unit. Society is managed by systems–social, economic, political, legal–and the spiritual dimension could seem extraneous to the smooth running of daily life.