The text seems very negative about the physical body. Why is it described in such a foul way?

According to Chapter 8, the human body is described in stark terms to emphasize its transient and impure nature. It is called a "foul place of phlegm, pus, and saliva," a "house for worms and insects," and a "carriage of flesh, blood, and muscle." The text further describes it as a mere skeleton of bone and skin, a mess of foul-smelling waste, and a direct prison for the soul. However, this grim depiction serves a purpose. Despite being impure and perishable, the text concludes that it is only through this very body that one can reach the Lord, the Abode of Auspiciousness, highlighting its ultimate spiritual utility.