The text mentions that 'People call dreams an illusion, but sometimes the opposite reality appears.' How does the Patil's story in Chapter 13 exemplify this statement?

The Patil's story is a powerful illustration of how dreams can manifest a tangible, opposite reality. He suffered from a severe disease, but then he had two terrifying dreams. In one, he was beaten with a cane, and in another, his chest was crushed with a grinding stone. According to Chapter 13, these dream experiences, though illusory and agonizing, led to a real-world, positive outcome. Upon waking, the Patil found that his disease had completely vanished, and he was filled with an "unprecedented freshness." The suffering in the dream world brought about the "destruction of the disease and relief from sorrow" in his waking life. This demonstrates the principle that what might be dismissed as a mere illusion can have profound and beneficial consequences, proving that the opposite of the dream's negative content can become a reality.