The Chapter of Abbreviated Texts on Monastic Law
AN 2.280–309 Vinayapeyyālavagga
280. "For two reasons the Realized One laid down training rules for his disciples.
What two? For the well-being and comfort of the Saṅgha. … For keeping difficult persons in check and for the comfort of good-hearted mendicants … For restraining defilements that affect this life and protecting against defilements that affect lives to come … For restraining threats to this life and protecting against threats to lives to come … For restraining faults that affect this life and protecting against faults that affect lives to come … For restraining hazards that affect this life and protecting against hazards that affect lives to come … For restraining unskillful qualities that affect this life and protecting against unskillful qualities that affect lives to come … Out of sympathy for laypeople and for breaking up factions of mendicants with corrupt wishes … For inspiring confidence in those without it, and increasing confidence in those who have it … For the continuation of the true teaching and the support of the training. These are the two reasons why the Realized One laid down training rules for his disciples."