MN1 Mūlapariyāya Sutta: The Root of All Things.
The Buddha analyses the cognitive processes of four types of individuals—the untaught ordinary person, the disciple in higher training, the arahant, and the Tathāgata.
“This is one of the deepest and most difficult suttas in the Pali Canon, and it is therefore suggested that the earnest student read it only in a cursory manner on a first reading of the Majjhima Nikāya, returning to it for an in-depth study after completing the entire collection.”
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