Working out how to explain the purpose of combining meditation practices with different focus areas.
I think the Theravadan framing is pretty good, but... somewhat lacking? And I don't think vaguely ascribing Reasons is good enough. This is all very straightforward.
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Combine three core practices (concentration, insight, emotions) to stabilize the practice, draw it all together and provide an overall structure.
But combining any two practices will also produce a distinctive set of effects, which are contextually useful/superior.
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Doing extensive work on emotions when your life is already forcing that upon you, for example, is a recipe for disaster.
Concentration practices help calm you down. These are often good to prioritize when things are not going so well.
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Everything has its time, its place, its appropriate context. Knowing when to do what is just as important as knowing *how* to do it.
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