Recognition
Dhāraṇā 58 · The supportless body
Seated or lying down, contemplate the body as resting on nothing at all; as the mind thins, the stored residues thin with it — in a moment, the verse says.
You are always resting on something — a seat, a floor, a bed — and the body's constant, unnoticed negotiation with its support is one of the mind's oldest occupations. This dhāraṇā removes the support in imagination and watches what the mind does when its oldest job is gone.
The method
The verse allows either posture: āsane śayane sthitvā — seated, or lying down. Settle fully first; a body still fidgeting cannot be convincingly weightless. Then contemplate the body as nirādhāra, supportless — not floating above the seat, which merely substitutes air for wood, but as having nothing beneath it at all, no direction that counts as down. The felt pressure at the buttocks or the back is not argued away; it is simply no longer read as resting on. Sensation stays, interpretation goes.
Held steadily, this contemplation thins the mind — manasi kṣīṇe, the verse says, as the mind becomes attenuated. And then the striking promise: kṣaṇāt kṣīṇāśayo bhavet — in a moment the āśaya, the stored dispositions, the deep sediment of past impressions, are attenuated too. Not worked through one by one; thinned wholesale, because the ground they rest on has been withdrawn.
How it works
The residues persist because there is a somewhere for them to lie — a substrate, a body-anchored 'me' they belong to. The mind's sense of being placed is the root form of that substrate. Take away placement and the whole architecture above it loses its footing at once. This is why the verse can promise speed: the practice does not empty the storehouse, it dissolves the floor.
The felt contradiction is the working surface: the floor plainly holds the body, and the contemplation withdraws every image of being held. When the two collide, the mind thins exactly as the verse describes — it has nothing left to stand its body-image on. Done lying down it borders the threshold of sleep; the practice is to let the supports dissolve while the watching stays awake, and the verse's 'in a moment' is to be taken seriously rather than waited for.
आसने शयने स्थित्वा निराधारं विभावयन् । स्वदेहं मनसि क्षीणे क्षणात्क्षीणाशयो भवेत् ॥ ८१ ॥
Whether seated or lying down, contemplating one's own body as supportless, as the mind becomes attenuated, in a moment one's (latent) residues are attenuated.
आसन पर या शय्या पर स्थित होकर, अपने शरीर को निराधार भावित करे; मन के क्षीण होने पर, क्षण भर में साधक के (वासना-) आशय क्षीण हो जाते हैं।