References – SN 35.153: Is There a Method? 
Readings by Ajahn Pasanno:
Sutta: SN 35.127, Saḷāyatanasaṁyutta, “Bhāradvāja.”
Sutta: SN 35.135, Saḷāyatanasaṁyutta, “The Opportunity.”
Sutta: SN 35.153, Saḷāyatanasaṁyutta, “Is There a Method?.”
Sutta: SN 35.155, Saḷāyatanasaṁyutta, “A Speaker on the Dhamma.”
The Fourth Foundation of Mindfulness [2013], Session 42
“Does SN 35.153 indicate that keeping an eye on the mind and knowing when defilements are present lead all the way to the final goal?” Answered by Ajahn Pasanno. [Mindfulness of mind] [Unwholesome Roots] [Liberation]
Story: A monk logs hours of meditation but is frustrated with the results. [Meditation/Results]
Follow-up: “Does this mean that you can’t just apply a single skill without investigating whether it is actually helping?” [Meditation/Techniques] [Right Effort]
The Fourth Foundation of Mindfulness [2013], Session 42, Excerpt 3