佛說盂蘭盆經疏 2.34

2.34

二、如來廣示因緣（八）。如來廣示因緣，且依三藏大分八段：第一彰母罪深、第二明子德劣、第三斥邪無力、第四顯正有能、第五許以救方、第六示其正法、第七孝子領悟、第八慈母獲益。

Second, the Tathāgata broadly explains the causes and conditions (eight parts). The Tathāgata broadly explains the causes and conditions, following the Tripiṭaka Master's division into eight sections: first, revealing the mother's deep offenses; second, clarifying that the son's virtue is insufficient; third, rebuking the heterodox for having no power; fourth, showing that the orthodox have the ability; fifth, promising the method of rescue; sixth, demonstrating the proper dharma; seventh, the filial son understanding and awakening; eighth, the loving mother obtaining benefit.