What is the philosophical critique of a life spent in ordinary stages without higher purpose, as described in Chapter 8?

Chapter 8 offers a sharp critique of a life lived without spiritual awareness. It states that half of life is lost to sleep and the rest to restlessness. The text describes the typical life cycle as childhood being spent in play, youth in passion, and old age burdened by infirmity and disease. Chapter 8 questions if the purpose of life is merely to be born, grow, breathe, and live a long time. It argues that if life is wasted only on the four activities of eating, sleeping, fear, and mating, there is no meaningful difference between a human and a dog, and that such a human birth is ultimately useless.