sn.51.33-44 Saṁyutta Nikāya (Linked Discourses)

The Ganges River, Etc.

“Mendicants, the Ganges river slants, slopes, and inclines to the east.
In the same way, a mendicant who develops and cultivates the four bases of psychic power slants, slopes, and inclines to extinguishment.
And how does a mendicant who develops the four bases of psychic power slant, slope, and incline to extinguishment?
It’s when a mendicant develops the basis of psychic power that has immersion due to enthusiasm …
energy …
mental development …
inquiry, and active effort.
In the same way, a mendicant who develops and cultivates the four bases of psychic power slants, slopes, and inclines to extinguishment.”

(To be expanded for each of the different rivers as in SN 45.91–102.)
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.