"A Book Of Life" deals with spirituality by way of spiritual concepts - those within us that have a deeper human meaning and application. They may be instilled by a religion that one subscribes to or be highly personalised, not subscribing to any particular denomination. There are no hard and fast rules because spirituality is highly individualistic. There are many fundamental concepts and examples however, and these form a pathway to spiritual maturity and enlightenment. You must discover how you relate to your spiritual self in order to become enlightened, starting with your understanding of human emotions. The material within will set you up to become enlightened.