How does Chapter 8 describe the transient and ultimately impure nature of the physical body?

In Chapter 8, the physical body is described as being in a constant state of flux and fundamentally impure. The text uses the analogy of a lamp's flame, which appears singular but is different every moment, to illustrate the ever-changing nature of the body from childhood to old age. This transition happens so subtly that we don't even notice the change from one moment to the next. Furthermore, Chapter 8 offers a stark depiction of the body as a "washroom of excrement and urine, a foul place of phlegm, pus, and saliva," emphasizing its temporary and unclean state, with death being an ever-present possibility at every moment.