[322] On one occasion the Venerable Sāriputta and the Venerable Mahākoṭṭhita were dwelling at Bārāṇasī, in the Deer Park at Isipatana. Then the Venerable Mahākoṭṭhita, having emerged from seclusion in the evening, … Sitting to one side, the Venerable Mahākoṭṭhita said this to the Venerable Sāriputta: "'Ignorance (avijjā), ignorance,' friend Sāriputta, it is said. What now, friend, is ignorance, and in what way has one become immersed in ignorance?"
"Here, friend, the uninstructed worldling (assutavā puthujjano) does not understand as it really is (yathābhūta) form (rūpa) that is subject to origination as 'form subject to origination'; does not understand as it really is form that is subject to vanishing as 'form subject to vanishing'; does not understand as it really is form that is subject to origination and vanishing as 'form subject to origination and vanishing'; feeling (vedanā) subject to origination … feeling subject to vanishing … feeling subject to origination and vanishing … perception (saññā) subject to origination … volitional formations (saṅkhārā) subject to origination … volitional formations subject to vanishing … He does not understand as it really is volitional formations subject to origination and vanishing as 'volitional formations subject to origination and vanishing'; consciousness (viññāṇa) subject to origination … consciousness subject to vanishing … He does not understand as it really is consciousness subject to origination and vanishing as 'consciousness subject to origination and vanishing.'
This, friend, is called ignorance, and in this way has one become immersed in ignorance."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.