When the Buddha fails to achieve reconciliation among quarrelsome bhikkhus at Kosambi, he withdraws into solitude and later encounters an inspiring community of monks devoted to liberation. He teaches them the path of inner purification based on his own practice prior to full awakening—discerning and abandoning eleven subtle impurities of mind, developing collectedness in three ways, and realizing unshakable liberation.

The Buddha provides a detailed analysis of the six sense bases, differentiating worldly feelings based on attachment from those born of renunciation and insight. He outlines a progressive path of abandoning lower states for higher ones, guiding practitioners through refined meditative states toward complete liberation.