The passages in this compilation helps to define spiritual freedom and self-mastery. The book begins with descriptions of the ordinary human existence ruled by the elemental Ignorance of material Nature. Subsequent parts outline the first steps towards achieving freedom from and mastery over our human imperfections: becoming conscious of one's inner movements, purification of the lower nature leading to self-mastery, and detachment from the movements of the outer being. Absolute mastery and supreme freedom can be finally attained through the liberation from the ego and the radical transformation of the mental, vital, and physical nature into the divine nature.