Based on Chapter 10, what is the most effective spiritual practice (Sadhana) for a devotee, and what are its promised results?

Chapter 10 presents the remembrance of the Guru with a heart full of love as the best and most accessible spiritual practice (Sadhana). This simple act, costing 'not even a single penny,' is said to yield great fruit with little effort. As detailed in Chapter 10, its benefits are profound: it unties the 'knot of birth and death,' causes all attachment to sense objects to vanish, and destroys both accumulated (Sanchit) and current (Kriyaman) karmas. Ultimately, this path of devotion leads to the effortless attainment of liberation, characterized by bliss.