References – SN 35.231: The Milk-Sap Tree 
Readings by Ajahn Pasanno:
Sutta: SN 35.235, Saḷāyatanasaṁyutta, “The Exposition on Burning.”
Sutta: SN 35.238, Saḷāyatanasaṁyutta, “The Simile of the Vipers.”
Sutta: SN 35.241, Saḷāyatanasaṁyutta, “The Simile of the Great Log (1).”
Sutta: SN 35.231, Saḷāyatanasaṁyutta, “The Milk-Sap Tree.”
Sutta: SN 35.234, Saḷāyatanasaṁyutta, “Udāyī.”
The Fourth Foundation of Mindfulness [2013], Session 43
Comment by Ajahn Cunda: SN 35.231 mentions that sense objects do not obsess the mind [of an arahant] rather than one not experiencing things. [Sense bases] [Arahant] [Clinging]
Response by Ajahn Pasanno and Ajahn Ñāṇiko. [Mahāyāna]
The Fourth Foundation of Mindfulness [2013], Session 43, Excerpt 4