I practiced Burmese meditation in northern Thailand in order to
gain insight by way of nanas (knowledges). I've searched sutta
to find reference to these (such as Udayabbhaya Nana) and came
up blank. As I understand it, they're shrouded in a bit of
mystery because preconceptions could ruin the experience. Is
this a system developed long after the Buddha? Did he only
allude to it?

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