References – AN 3.102: Basis 
“My understanding of samādhi is the one-pointedness of attention that focuses on the ānāpāna spot, whereas vipassanā is not. When you were reading about how they were the same (Stillness Flowing by Ajahn Jayasaro, p. 372), my understanding went right out the window.” Answered by Ajahn Pasanno. [Concentration] [Unification] [Mindfulness of breathing] [Insight meditation] [Ajahn Chah] // [Language]
“The firm establishing of the mind”—The Thai translation of samādhi. [Thai] [Translation]
Sutta: AN 3.102: Pliable and ready to work.
Recollections of Ajahn Chah: 100th Birthday Anniversary Celebration [2018], Session 4, Excerpt 10
Readings by Ajahn Pasanno:
The Island by Ajahn Pasanno and Ajahn Amaro, Chapter 13, pp. 230-233:
Suttas: MN 29.7; MN 24.10; AN 3.101; MN 70.13, .22 & .23.
Sutta: AN 3.102: Nimitta.
Sutta: MN 70: Kīṭāgiri Sutta.
Readings from The Island [2025], Session 24
“Could [the principles in AN 3.102] also be related to practicing anāpānāsati?” Answered by Ajahn Pasanno. [Investigation of states] [Right Effort] [Mindfulness of breathing]
Quote: “Dhamma is that which is just right.” — Ajahn Chah. [Ajahn Chah] [Dhamma]
Quote: “Dhamma is neither high nor low, not dark or light, not tall or short. It’s just right.” — Ajahn Kinaree. [Ajahn Kinaree] [Middle Path]
Readings from The Island [2025], Session 24, Excerpt 1
“In practice, how do you know if you are tending towards laziness or restlessness, etc.?” Answered by Ajahn Pasanno and Ajahn Karuṇadhammo. [Investigation of states] // [Concentration] [Direct experience] [Clear comprehension] [Ajahn Sumedho]
Sutta: AN 3.102: “The mind becomes malleable, wieldy, luminous, not brittle ...”