འཕགས་པ་ཤན་ཏ་རྒྱས་པ་ཆན་པའ་སྡ་ཉ་མའ་སྙང་པ་ཞས་བྱ་བའ་མད 7.6

7.6

Similarly, when any kind of form—whether sentient or not—appears before their eyes, they will systematically perceive such forms as white skeletons connected with ligaments, without adding or omitting anything. They will not let their minds be distracted from this. This is their practice of tranquility.

“At that time, they will train by observing, ‘These are the bones of the skull, these are the teeth, and this is the throat,’ all the way down to ‘These are the bones of the toes.’ In that way, they will accomplish mental concentration that is joined with insight. Why is that? Because they accomplish concentration intentionally. When their minds become utterly still and tranquil, this should be their meditation. When their minds become utterly still and tranquil, they should cultivate that while practicing insight alone. When their minds become utterly still and tranquil while practicing insight alone, they should cultivate that by examining and disintegrating the heaps of bones and grinding them into dust. They should then consider how the mental observation of this dust of bones is not uncaused but rather has the characteristic of being exhaustible and perishable. In that way, they will realize the acceptance that accords with insight.

“Because they observe the completely white dust of bones in all material appearances and because they understand that the mind is quick and swift, they will also directly understand the acceptance that accords with arising.⁵⁰ Because they observe the insubstantial nature of the completely white dust of bones, which they perceive without attachment in all forms, and because they understand the lack of self in the mind that is quick and swift, they will directly understand the acceptance that accords with disintegration.