an.11.502-981 Aṅguttara Nikāya (Numbered Discourses)

Untitled Discourses on the Eye, Etc.

“Mendicants, a cowherd with eleven factors can maintain and expand a herd of cattle.
What eleven?
It’s when a cowherd knows form …
In the same way, a mendicant with eleven qualities can meditate observing impermanence in the eye …

meditate observing letting go. …”