Based on Baba's discourse in this chapter, what is the origin of desire and what is the key to overcoming it?

According to the teachings in Chapter 3, Sai Baba explains that desires originate in the intellect and have no connection to the Soul. Since Sai Maharaj is the very form of the Soul, there is no impulse for desire within Him. The path to overcoming desire lies in self-realization. Baba states that when the essence of the question 'Who am I?' is truly understood, and one grasps the truth that the Self is omnipresent, then desires naturally dissolve. He uses a powerful metaphor, explaining that these desires "dissolve like hail heated by the rays of the sun," indicating that self-knowledge completely melts away the root of desire.