On the Bank of the SutanuSutanusutta

At one time Venerable Anuruddha was staying near Sāvatthī on the bank of the Sutanu.Ekaṁ samayaṁ āyasmā anuruddho sāvatthiyaṁ viharati sutanutīre. Then several mendicants went up to Venerable Anuruddha, and exchanged greetings with him.Atha kho sambahulā bhikkhū yenāyasmā anuruddho tenupasaṅkamiṁsu; upasaṅkamitvā āyasmatā anuruddhena saddhiṁ sammodiṁsu. When the greetings and polite conversation were over, they sat down to one side, and said to him:Sammodanīyaṁ kathaṁ sāraṇīyaṁ vītisāretvā ekamantaṁ nisīdiṁsu. Ekamantaṁ nisinnā kho te bhikkhū āyasmantaṁ anuruddhaṁ etadavocuṁ:

“What things has Venerable Anuruddha developed and cultivated to attain great direct knowledge?”“katamesaṁ āyasmā anuruddho dhammānaṁ bhāvitattā bahulīkatattā mahābhiññataṁ patto”ti?

“Reverends, I attained great direct knowledge by developing and cultivating the four kinds of mindfulness meditation.“Catunnaṁ khvāhaṁ, āvuso, satipaṭṭhānānaṁ bhāvitattā bahulīkatattā mahābhiññataṁ patto. What four?Katamesaṁ catunnaṁ? I meditate observing an aspect of the body—keen, aware, and mindful, rid of covetousness and displeasure for the world.Idhāhaṁ, āvuso, kāye kāyānupassī viharāmi ātāpī sampajāno satimā, vineyya loke abhijjhādomanassaṁ; I meditate observing an aspect of feelings …vedanāsu …pe… mind …citte …pe… principles—keen, aware, and mindful, rid of covetousness and displeasure for the world.dhammesu dhammānupassī viharāmi ātāpī sampajāno satimā, vineyya loke abhijjhādomanassaṁ— I attained great direct knowledge by developing and cultivating these four kinds of mindfulness meditation.imesaṁ khvāhaṁ, āvuso, catunnaṁ satipaṭṭhānānaṁ bhāvitattā bahulīkatattā mahābhiññataṁ patto.

And it was by developing and cultivating these four kinds of mindfulness meditation that I directly knew the lower principle as lower, the middle principle as middle, and the higher principle as higher.”Imesañca panāhaṁ, āvuso, catunnaṁ satipaṭṭhānānaṁ bhāvitattā bahulīkatattā hīnaṁ dhammaṁ hīnato abbhaññāsiṁ, majjhimaṁ dhammaṁ majjhimato abbhaññāsiṁ, paṇītaṁ dhammaṁ paṇītato abbhaññāsin”ti.