How does Chapter 18 argue against the idea that a Guru's teachings should be kept secret, and what evidence does it provide?

Chapter 18 directly refutes the notion that a Guru's instructions to one person should not be shared with others, calling this belief an "imaginary and a meaningless fuss." The text argues that a Guru's teachings, including those received in dreams, are meant to be shared for the enlightenment of all. To support this position, Chapter 18 provides the example of the sage Budhakaushika, who is presented as proof because he narrated his dream-vision of the Ram Raksha initiation to everyone. The chapter concludes the argument by comparing the Guru to monsoon clouds that shower the water of self-bliss on everyone without distinction.