What are the essential duties of a disciple on the spiritual path, based on the teachings in Chapter 16?

Chapter 16 of Sai Satcharitra emphasizes that a disciple's primary duty is to have firm faith and surrender completely to the Sadguru. The text warns against using one's own 'cleverness' (Chaturai) or having any neglect in service, as this will lead to trouble. Instead of relying on their own limited understanding, a disciple should simply surrender, as the Guru is aware of the disciple's pitfalls and provides the necessary remedy. The chapter states that humble service with faith is the path to union with Brahman, and all other means will fail without it.