What are the core teachings presented in Chapter 49 of the Sai Satcharitra regarding the Sadguru and the nature of devotion?

Chapter 49 teaches that the Sadguru, Sai, is an unfathomable being whose greatness is beyond description, so much so that even the Vedas grew weary of praising Him. The author notes that while true praise is silence, the joy of experiencing Sai's qualities compels sharing, much like a sweet delicacy is best enjoyed with others. As mentioned in this chapter, Sai is the crest-jewel of saints and the remover of worldly difficulties for His devotees. The highest form of spiritual practice is presented as meditation on one's Guru, which is considered greater than pilgrimages, sacrifices, or even singing Hari's name. True devotion is defined by a complete lack of ego and pride.