The Related Suttas Collection 51.33–44

4. Abbreviated Texts on the Ganges

The Ganges River, Etc.

“Bhikkhus, the Ganges river slants, slopes, and inclines to the east. In the same way, a bhikkhu who develops and cultivates the four bases of psychic power slants, slopes, and inclines to Nibbana.

And how does a bhikkhu who develops the four bases of psychic power slant, slope, and incline to Nibbana? It’s when a bhikkhu develops the basis of psychic power that has immersion due to enthusiasm … energy … mental development … inquiry, and active effort.

That’s how a bhikkhu who develops and cultivates the four bases of psychic power slants, slopes, and inclines to Nibbana.”

Six on slanting to the east, and six on slanting to the ocean; these two sixes make twelve, and that’s how this chapter is recited.