Thus it was said by the Blessed One, said by the Arahant, I have heard:
“Bhikkhus, abandon one thing; I am your guarantor for non-returning. What one thing? Bhikkhus, abandon conceit (pride); I am your guarantor for non-returning.”
The Blessed One spoke this matter. Therefore, it is said thus:
"When overcome by conceit,
beings go to a bad destination;
Completely comprehending conceit,
those with insight 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, thus have I heard.
Related Teachings:
Way of Practice to eradicate the conceit “I Am” (SN 22.89) - Venerable Khemaka is ill, and some elder bhikkhus ask Dāsaka to convey their concern to him. A series of exchanges ensue, mediated by Dāsaka, until Khemaka, despite his illness, goes to see the elder bhikkhus himself. The elders inquire about his understanding of the Dhamma. Khemaka explains that while he does not identify any of the five aggregates (form, feeling, perception, formations, and consciousness) as self, he still experiences a subtle “I am” conceit associated with these aggregates. He likens this to the lingering scent on a cleaned cloth, which eventually fades away.
Engaging in Debate (SnP 4.8) - In this verse, the Buddha advises Pasūra on the futility of engaging in debates and the dangers of becoming conceited.
The Simile of the Tree Trunk | Eight obstacles to avoid on the path of enlightenment (SN 35.241) - The Buddha gives a parable of a large log floating downstream, which, if it steers clear of the many obstacles, will eventually reach the ocean. A bhikkhu asks for an explanation, and the Buddha clarifies each item. A cowherd named Nanda was listening, and determined to go forth.