References – Iti 34: Ardour 
Sutta / Itivuttaka / Iti 34: Ātāpīsutta

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Readings by Ajahn Pasanno: [Right Mindfulness]

Right Mindfulness pp. 8-12.

Sutta: Iti 34: Ardour. [Ardency]

The Four Foundations of Mindfulness [2015], Session 14