I think it is a bit of mix and match I suppose.
There are also three ways of looking for information from outside the Canon
to fill in these gaps. The first is to ask for advice from living people
proficient in breath meditation. The Canon itself encourages this approach in AN
4:94, which advises you to approach a person skilled in insight and tranquility
and to ask for instructions on how to develop those qualities in your own mind.
Similarly, AN 9:36 recommends asking those who are skilled in attaining and
emerging from both the dimension of neither perception nor non-perception
and the cessation of perception and feeling for instruction in how to attain and
emerge from those dimensions. The same principle applies here.
The second way to look outside the Canon for information that will fill in the
gaps in the four tetrads is to experiment on your own
. The Canon implicitly
advises this method in passages where it makes distinctions without explaining
The third way to look outside the Canon for information that will fill in the
gaps in the four tetrads is to consult books dealing with these topics
this would include the commentarial literature—such as the Visuddhimagga
(Path of Purity) or the commentaries and sub-commentaries on the various
sections of the Canon—but in the case of breath meditation, this literature
diverges widely from what the Canon has to say.
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