According to the provided text, how does the path to spiritual realization in the Kali Yuga compare to previous ages, and what specific path does the author choose?

The text draws a clear distinction between the spiritual paths of different eras. As noted in Chapter 3, what was achieved in the Kruta Age by 'meditation,' in the Treta Age by 'sacrifice,' and in the Dwapara Age by 'worship,' can all be attained in the current Kali Age through 'singing the Name' and service to the Guru. While acknowledging that some devotees build temples, go on pilgrimages, or perform kirtan, the author explicitly chooses a different route. He declares, as found in Chapter 3, "We shall take the straight path: the study of Sai’s life story." This indicates his belief that studying the life of the Guru is a direct and effective means of spiritual progress in this age.