How does Chapter 45 explain the relationship between serving the Guru and attaining Moksha, and what is the 'speech-sacrifice' mentioned?

Chapter 45 presents a profound spiritual concept by positioning service to the Guru as a path that transcends even the direct pursuit of Moksha (liberation). The text explicitly states that the Guru's feet are "even more powerful than Moksha." By serving the Guru with devotion, liberation is said to enter one's home unknowingly, suggesting that Guru-bhakti is a more direct and grace-filled path. Regarding the 'speech-sacrifice' or 'Vag-yagna,' Chapter 45 uses this term to describe the author's humble offering of the Satcharitra's stories. The author, considering himself of little knowledge, presents this work as a sacred offering, hoping the all-knowing listeners will accept it and that the Guru will ensure its completion.