How does Chapter 8 portray the transient and fragile nature of the human body and the passage of time?

In Chapter 8, the human body and the flow of time are depicted as fleeting and deceptive. The text uses the analogy of a lamp flame, which appears constant but is different every moment, to describe the body's state. It notes that childhood, youth, and old age are distinct stages, but their transitions happen so naturally that no one notices the exact moment of change. Chapter 8 further emphasizes this impermanence by stating that what is seen one moment perishes in the next. It culminates in a stark description of the body as a foul "washroom of excrement and urine" where death is placed at every moment.