What does Chapter 10 describe as the most effective and simplest form of spiritual practice (Sadhana)?

In Chapter 10, the most effective and simple spiritual practice, or Sadhana, is described as constantly remembering the Guru with a heart full of love. This method is praised as being the "best of all means" because it costs nothing, "not even a single penny," and yields great fruit with very little effort. The text claims that through this simple act of remembrance, the profound "knot of birth and death is untied." It is presented as a powerful and accessible path for spiritual progress, allowing everything to come easily into one's hands, and is a practice one should strive for every moment while their senses are still intact.