What does Chapter 10 say is the simplest and most effective spiritual practice, and what are its promised rewards?

Chapter 10 presents a very simple yet profound spiritual practice, describing it as the 'best of all means (Sadhana).' This practice is to 'always remember with a heart full of love Him who is devoted to the welfare of all people.' The chapter emphasizes that this method costs nothing and requires little effort to achieve great results. The primary reward promised is that by this mere remembrance, 'the knot of birth and death is untied.' It also reinforces the Guru's power by stating that placing faith in His feet can lead to a change in one's destiny.