What fundamental belief about achieving salvation is presented in the preface of the Shri Sai Satcharita?

The preface to the Shri Sai Satcharita opens by establishing a foundational principle deeply held in Aryavarta. As detailed in Chapter 0, there is a firm and ancient belief, dating back to Vedic times, that there can be no salvation without the grace of a Sadguru. This principle is not a recent idea but is supported by Vedic scriptures. The text emphasizes that this grace is the absolute prerequisite for spiritual liberation, highlighting the central role of the Guru in a seeker's journey toward the ultimate goal.