Can you explain the relationship between the Soul and the body as detailed in Chapter 19?

According to Chapter 19, the union of the Soul (Atma) and the body is a supreme exception to the rule that friendship exists only between those of similar nature. These two are fundamentally different—the body is perishable, while the Soul is changeless and imperishable. Despite this, their affection is so extraordinary that they cannot bear to be apart. The chapter states that it is this immense love between the different Soul and body that causes the cycle of worldly existence, or Samsara, to continue. Ultimately, the Soul is described as distinct from the body, senses, and mind.