How does the text explain the cycle of rebirth and the path to becoming immortal?

The text posits that the cycle of rebirth is propelled by the seeds of desires and actions. As Chapter 37 details, just as trees come from seeds, a new body is obtained after death through the seeds of one's past actions and lingering desires. This cycle, referred to as the ocean of worldly existence, continues with unhindered speed as long as desires persist. The path to immortality, therefore, lies in destroying these desires at their very root. When the root is destroyed, the "knot in the heart" is removed, and a mortal man becomes immortal, which is presented as a core teaching in the Vedanta.