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AN I Suttas 51-60 Accharāsaṅghāta Vagga “The Snap of a Finger” 51. “Luminously radiant, Bhikkhus, is the heart. However, it becomes spoiled by the suffocating encroachment of the corrupting defilements. “This, the untrained ordinary dense person (putujjana) does not know as it really is, and because of this reason, I declare that for such an untrained ordinary dense person, there can be no development of the heart.”