Is it permissible to share the teachings or instructions received from a Guru with others, according to the text?

Yes, Chapter 18 strongly advocates for sharing the Guru's teachings openly. The text dismisses the notion that a Guru's words should be kept secret as a "merely imaginary and a meaningless fuss." To reinforce this point, it provides the example of the sage Budhakaushika, who narrated his dream-vision of the Ram Raksha initiation to everyone for their enlightenment. Therefore, according to the principles laid out in Chapter 18, not only direct instructions but even spiritual experiences received in dreams should be shared for the benefit and enlightenment of all.