How does Chapter 10 explain the Sadguru's ability to affect a devotee's karma?

Chapter 10 of the Shri Sai Satcharitra details the profound impact a Sadguru has on a devotee's karmic balance. The text asserts that through the Guru's grace, which is earned by sincere devotion and faith, a devotee's karma can be nullified. Specifically, it states that by the Sadguru's mere sight, the "knots of the heart are broken" and attachments to worldly objects vanish. Most significantly, Chapter 10 claims that both accumulated past karmas ('Sanchit') and current, unfolding karmas ('Kriyaman') are destroyed. This purification process is presented as a direct consequence of the Guru's power, clearing the path for the devotee's spiritual progress and liberation.