Can you explain the hierarchy of spiritual practices as presented in Chapter 49, and what is considered the ultimate practice?

Certainly. Chapter 49 of the Shri Sai Satcharita outlines a clear hierarchy of spiritual endeavors. It begins by stating that penance is greater than pilgrimages, vows, sacrifices, or charity. Moving up the scale, the singing of Hari's name is considered even greater than penance. However, the chapter unequivocally declares that 'the meditation on one's own Guru is the greatest of all.' For the devotees of Sai, this means that Sai alone is their object of meditation and worship. This places supreme importance on the Guru-disciple relationship and Guru-bhakti over all other forms of spiritual practice.