And moreover, sir, how the Buddha teaches the attainments of vision is unsurpassable. There are these four attainments of vision.

Firstly, some ascetic or brahmin—by dint of keen, resolute, committed, and diligent effort, and right focus—experiences an immersion of the heart of such a kind that they examine their own body up from the soles of the feet and down from the tips of the hairs, wrapped in skin and full of many kinds of filth. ‘In this body there is head hair, body hair, nails, teeth, skin, flesh, sinews, bones, bone marrow, kidneys, heart, liver, diaphragm, spleen, lungs, intestines, mesentery, undigested food, feces, bile, phlegm, pus, blood, sweat, fat, tears, grease, saliva, snot, synovial fluid, urine.’ This is the first attainment of vision.

Furthermore, some ascetic or brahmin attains that and goes beyond it. They examine a person’s bones with skin, flesh, and blood. This is the second attainment of vision.

Furthermore, some ascetic or brahmin attains that and goes beyond it. They understand a person’s stream of consciousness, unbroken on both sides, established in both this world and the next. This is the third attainment of vision.

Furthermore, some ascetic or brahmin attains that and goes beyond it. They understand a person’s stream of consciousness, unbroken on both sides, not established in either this world or the next. This is the fourth attainment of vision.

This is unsurpassable when it comes to attainments of vision.