According to Chapter 18, should the teachings of a Guru be kept secret?

No, Chapter 18 strongly refutes the idea that a Guru's teachings should be kept secret. The text dismisses this notion as 'merely imaginary and a meaningless fuss.' It clarifies that not only direct instructions but even teachings received in dreams should be shared with everyone for their collective enlightenment. As stated in Chapter 18, the sage Budhakaushika serves as proof of this principle, as he narrated his dream-vision of the Ram Raksha initiation to all. The chapter compares the Guru to rain clouds that shower the water of self-bliss with love upon everyone.