§4.1  “I don’t envision a single thing that is as quick to reverse itself as the mind—so much so that there’s no satisfactory simile for how quick to reverse itself it is.” — AN 1:49

§4.2  “Monks, have you ever seen a moving-picture show [an ancient show similar to a shadow-puppet show]?”

“Yes, lord.”

“That moving-picture show was created by the mind. And this mind is even more variegated than a moving-picture show. Thus one should reflect on one’s mind with every moment: ‘For a long time has this mind been defiled by passion, aversion, & delusion.’ From the defilement of the mind are beings defiled. From the purification of the mind are beings purified.

“Monks, I can imagine no one group of beings more variegated than that of common animals. Common animals are created by mind [i.e., each animal’s body is the result of that animal’s kamma]. And the mind is even more variegated than common animals. Thus one should reflect on one’s mind with every moment: ‘For a long time has this mind been defiled by passion, aversion, & delusion.’ From the defilement of the mind are beings defiled. From the purification of the mind are beings purified.” — SN 22:100

§4.3  “‘Monks, a beginning point for ignorance—[such that one might say], “Before this, ignorance did not exist; then it came into play”—cannot be discerned.’ This, monks, has been said. Nevertheless, it can be discerned, ‘Ignorance comes from this condition.’ And I tell you, ignorance has its food and is not without food. And what is the food for ignorance? ‘The five hindrances,’ it should be said. And I tell you, the five hindrances have their food and are not without food. And what is the food for the five hindrances? ‘The three forms of misconduct’ … And what is the food for the three forms of misconduct? ‘Lack of restraint of the senses’ … And what is the food for lack of restraint of the senses? ‘Lack of mindfulness & alertness’ … And what is the food for lack of mindfulness & alertness? ‘Inappropriate attention’ … And what is the food for inappropriate attention? ‘Lack of conviction’ … And what is the food for lack of conviction? ‘Not hearing the true Dhamma’ … And what is the food for not hearing the true Dhamma? ‘Associating with people of no integrity’ [or: ‘not associating with people of integrity’], it should be said.…

“Just as when the devas pour rain in heavy drops & crash thunder on the upper mountains: The water, flowing down along the slopes, fills the branches of the mountain ravines & gullies. When the branches of the mountain ravines & gullies are full, they fill the little lakes. When the little lakes are full, they fill the big lakes… the little rivers… the big rivers. When the big rivers are full, they fill the great ocean. Such is the food of the great ocean, and thus is it made full. In the same way, when not associating with people of integrity is made full, it fills [the conditions for] not hearing the true Dhamma… lack of conviction… inappropriate attention… lack of mindfulness & alertness… lack of restraint of the senses… the three forms of misconduct… the five hindrances. When the five hindrances are made full, they fulfill [the conditions for] ignorance. Such is the food of this ignorance, and thus is it made full.

“Now, I tell you, clear knowing & release have their food and are not without food. And what is their food? ‘The seven factors for awakening [sambojjhaṅga],’ it should be said. And I tell you, the seven factors for awakening have their food and are not without food. And what is the food for the seven factors for awakening? ‘The four establishings of mindfulness [satipaṭṭhāna]’ … And what is the food for the four establishings of mindfulness? ‘The three forms of right conduct’ … And what is the food for the three forms of right conduct? ‘Restraint of the senses’ … And what is the food for restraint of the senses? ‘Mindfulness & alertness’ … And what is the food for mindfulness & alertness? ‘Appropriate attention’ … And what is the food for appropriate attention? ‘Conviction’ … And what is the food for conviction? ‘Hearing the true Dhamma’ … And what is the food for hearing the true Dhamma? ‘Associating with people of integrity,’ it should be said.…

“Just as when the devas pour rain in heavy drops & crash thunder on the upper mountains: The water, flowing down along the slopes, fills the branches of the mountain ravines & gullies… the little lakes… the big lakes… the little rivers… the big rivers. When the big rivers are made full, they fill the great ocean. Such is the food of the great ocean, and thus is it made full. In the same way, when associating with people of integrity is made full, it fills [the conditions for] hearing the true Dhamma… conviction… appropriate attention… mindfulness & alertness… restraint of the senses… the three forms of right conduct… the four establishings of mindfulness… the seven factors for awakening. When the seven factors for awakening are made full, they fill [the conditions for] clear knowing & release. Such is the food for this clear knowing & release, and thus are they made full.” — AN 10:61

§4.4  “Luminous, monks, is the mind. And it is defiled by incoming defilements. The uninstructed run-of-the-mill person doesn’t discern that as it has come to be, which is why I tell you that—for the uninstructed run-of-the-mill person—there is no development of the mind.”

“Luminous, monks, is the mind. And it is freed from incoming defilements. The well-instructed disciple of the noble ones discerns that as it has come to be, which is why I tell you that—for the well-instructed disciple of the noble ones—there is development of the mind.” — AN 1:51–52