Man is not only constituted of matter in his being but also of spirit. However well built a body he may have with its mechanism in good working order, there is still something that is wanting in him. For the physical body is sustained by material food and drink, breath by the air, mind by thoughts and imaginations and impressions; but that is not all, there is something besides mind and body that man possesses in his being, and that is his spirit, which is light, a divine light.