四分律刪繁補闕行事鈔 2.116

2.116

Concerning the two undetermined offenses (aniyata), the texts and commentaries have long set them forth, and they are explained under the prātimokṣa; here I briefly relate the main idea. The Sarvāstivāda-vinaya-vibhāṣā gives four reasons for their formulation: first, to stop slander; second, to eliminate disputes; third, to enhance and elevate the Buddhadharma; and fourth, to sever evil actions that obstruct the path according to their sequence.