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The Buddha describes the abandoning of delusion as the guarantee for non-returning.
Moha sutta - Delusion
This was said by the Blessed One, said by the Arahant, as I have heard:
"Bhikkhus, abandon one thing; I am your guarantor for non-returning. What one thing? Bhikkhus, abandon illusion; I am your guarantor for non-returning."
The Blessed One spoke on this matter. In this regard, it is said:
"Disoriented by delusion, through which, beings go to an unfortunate destination; Completely comprehending that delusion, those seeing clearly abandon it; Having abandoned it, they do not come again, to this world at any time."
This matter too was spoken by the Blessed One, as I have heard.