Ajahn Brahmali discusses sutta 56 from the Majjhima Nikaya, the collection of middle-length discourses: Upali Sutta, "Discourse with Upali".
"The Buddha disagrees with a Jain ascetic on the question of whether physical or mental deeds are more important. When he hears of this, the Jain disciple Upāli decides to visit the Buddha and refute him, and proceeds despite all warnings.", Sutta Central.
Read MN56 on Sutta Central here.
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