To a Sufi this body is the Temple of God and the heart His shrine; and as long as man keeps God away from His temple, from His shrine, his limited ego reigns, and that reign is called the Iron Age by the Hindus. A person who has not opened his heart to God to abide in may yet be a good person, but as his life will be involved in the activities of the world, his ego will turn from bad to worse, culminating into the worst state of mind, and it is that condition of mind which is personified in the religious term Satan.