Saṃyutta Nikāya 47

Connected Discourses on the Establishments of Mindfulness

51–62. The River Ganges—Eastward, Etc.

“Bhikkhus, just as the river Ganges slants, slopes, and inclines towards the east, so too a bhikkhu who develops and cultivates the four establishments of mindfulness slants, slopes, and inclines towards Nibbāna.

“And how, bhikkhus, does a bhikkhu develop and cultivate the four establishments of mindfulness so that he slants, slopes, and inclines towards Nibbāna? Here, bhikkhus, a bhikkhu dwells contemplating the body in the body … feelings in feelings … mind in mind … phenomena in phenomena, ardent, clearly comprehending, mindful, having removed covetousness and displeasure in regard to the world. It is in this way, bhikkhus, that a bhikkhu develops and cultivates the four establishments of mindfulness so that he slants, slopes, and inclines towards Nibbāna.”

(The remaining suttas of this vagga are to be similarly elaborated parallel to 45:92-102.)

Six about slanting to the east
And six about slanting to the ocean.
These two sixes make up twelve:
Thus the subchapter is recited.