Aṅguttara Nikāya — Discursos Numerados — 11.22–29 — Untitled Discourses on the Eye

22“Mendicants, a cowherd with eleven factors can’t maintain and expand a herd of cattle. What eleven? It’s when a cowherd doesn’t know form, is unskilled in characteristics, doesn’t pick out flies’ eggs, doesn’t dress wounds, doesn’t spread smoke, doesn’t know the ford, doesn’t know satisfaction, doesn’t know the trail, is not skilled in pastures, milks dry, and doesn’t show extra respect to the bulls who are fathers and captains of the herd. A cowherd with these eleven factors can’t maintain and expand a herd of cattle.
In the same way, a mendicant with eleven qualities can’t meditate observing impermanence in the eye …

23… meditate observing suffering …

24… not-self …

25… ending …

26… vanishing …

27… fading away …

28… cessation …

29… letting go …”