菩薩戒義疏 2.54

2.54

第三十六、不發誓戒。誓是必固之心，願中之勇烈意。始行心弱，宜須防持。若不發心作意，亦生違犯故制。七眾同犯，而用不必皆盡。大小乘不共，二乘不制，心易防持。序事有三：初一句標勸以發，一願下應發誓持戒，後一句結不發為過，中間十三復次正明誓體。

Thirty-sixth: the precept against failing to take pledges. A pledge is a mind of resolute certainty, the courageous and resolute resolve within a vow. At the beginning of practice, the mind is weak and needs to be guarded and upheld. If one does not generate this mind and make the resolve, transgressions will also arise, hence it was instituted. All seven assemblies equally commit an offense, but the applications are not necessarily all exhaustive. Mahāyāna and Hīnayāna do not share it; it is not instituted for the two vehicles, whose minds are easy to guard and uphold. The narrative of events has three parts: The initial sentence marks the exhortation to generate [the pledge]; from "One vow..." onward is the requirement to take pledges to uphold the precepts; the final sentence concludes that failing to generate it is a fault; and the thirteen recurring clauses in between properly clarify the substance of the pledges.