Ask why a practitioner who has sat an hour a day for four years has nothing to show for it, and the tradition's answer is not that they need more hours. It is that they were never in the right state, and so the hours did not count.
The state has no elegant name in the material. It is described as the borderline between waking and sleeping: the body asleep, the mind awake and alert, held at the hinge between the two without falling through it. Everything else in the method — the posture, the slowed breath, the fixed attention — is arranged to produce it and to hold it, and none of the rest is held to do much of anything outside it.
Why it is a precondition and not a result
This is the structurally important part, and it inverts the usual assumption about meditation. In most contemplative framings, depth is what practice gradually produces: you sit, and over years the sitting deepens. Here it runs the other way. The depth is the equipment. You reach the state first, and only then does the work — attention on the lower field, hour after hour — do what it is supposed to do.
Which means the practice has a threshold rather than a slope, and a practitioner below the threshold is not making slow progress. They are making none, and accumulating hours that they will later be told to discount. It is the least forgiving idea in the whole system and the one that most reliably explains the pattern of people sitting for years and reporting nothing.
What it rules out
The state is also the reason for the method's most striking prohibition. There is no visualisation in Mo Pai. No imagined light, no colour, no glowing sphere in the abdomen, no mantra, no counting, no narration. The tradition treats imaginative embellishment as the enemy of the practice, and the reasoning follows directly from the state: deliberate imagery is an active, effortful, verbal-adjacent operation, and it holds the mind in exactly the register the sitting is trying to leave. You cannot picture your way into a state defined by the absence of that kind of activity.
The same logic disposes of the distinction the material draws between meditation and concentration. Meditation, in its usage, is a relaxed state you can still think in — useful, pleasant, and not what is being asked for. Concentration is one point, held, with nothing else present. The estimate given is that an hour of the former might contain a minute of the latter, and it is the minute that counts.
What is actually being described
Stripped of the vocabulary, this is hypnagogia: the transitional state between wakefulness and sleep, which everyone passes through nightly and almost nobody stays in. It is well characterised. EEG shows the shift from alpha to theta activity; the phenomenology includes the loss of body awareness, sudden imagery, distorted time, and the sensation of perceiving without effort. The practice is asking for something ordinary — and then asking for it to be sustained deliberately for hours, which is not ordinary at all.
Practitioners describe correlates that go further: breathing falling to a cycle a minute or less, a heart rate low enough that they claim it would alarm anyone taking it, body temperature dropping. Claims of that shape are not absurd on their face. Deep meditative states have been measured producing substantial reductions in metabolic rate — considerably larger than the fall during sleep — in studies of advanced practitioners from other traditions, and the physiological plausibility of a slowed, cooled, low-demand state is not in dispute. What is unestablished is that any of it is doing what this tradition says it is doing.
One reported marker deserves flagging precisely because it is so often repeated: that in the deepest state a practitioner can see with the eyes closed. This is the sort of claim that gets treated as a milestone, and it is far better explained by hypnagogic imagery — which is vivid, involuntary, and routinely mistaken for perception — than by anything exotic. Treating it as a checkpoint is how people convince themselves they have arrived somewhere.
Why nobody can tell you if you are there
The state cannot be performed, and it cannot be inspected. There is no posture that demonstrates it, no breath count that proves it, and nothing an observer could see. A practitioner sitting in it and a practitioner sitting just short of it look identical, and — this is the difficult part — often feel identical from the inside, because the faculty that would notice the difference is the one being altered.
So the element that decides whether the practice works at all is also the element with no external check on it whatsoever. In a teaching relationship that gap is filled by someone experienced asking the right questions. Alone, with a written description, it is filled by the practitioner's own judgement about their own mental state, which is exactly the instrument the state is known to distort.
The honest summary
The borderline state is the most defensible thing in the method and the most dangerous to reason about. Defensible, because it is a real, documented, physiologically ordinary state that contemplative traditions across the world have independently identified as significant, and asking practitioners to find it is not a strange request. Dangerous, because nothing can count against it: it accounts for every failure, there is no observation a practitioner could make that would tell them the account is wrong, and it hands them a permanent reason to distrust their own hours and keep going.
If you take one thing from this element, take the deflationary version, which is also the useful one. Quality of attention matters more than quantity of sitting, most people substitute effort for depth, and an hour spent thinking about the lower dan tien is not an hour spent attending to it. That much is true, checkable against your own experience, and worth having regardless of what you make of the rest.