[352] "And how, Ānanda, does the calamity (upaddava) of a teacher come about? Here, Ānanda, a certain teacher resorts to a secluded lodging: a forest, the root of a tree, a mountain, a ravine, a mountain cave, a charnel ground, a forest thicket, the open air, a heap of straw. While he dwells thus withdrawn, brahmins and householders, townsfolk and country people come flocking around him. When brahmins and householders, townsfolk and country people have flocked around him, he hankers after infatuation, falls into greed, and reverts to abundance. This teacher, Ānanda, is called one beset by the calamity of a teacher. Evil, unwholesome states—defiling, conducive to renewed existence, fraught with distress, ripening in suffering (dukkha), making for future birth, aging, and death—have slain him. Thus indeed, Ānanda, does the calamity of a teacher come about."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.