四分律行事鈔資持記 2.271

2.271

答中，初以義略分。衍，猶遍也。以律訓法，法即遍制，恒令不起，不待對事；戒者訓禁，禁即對過，防遏為功，必約對境；二皆有相，故竝名儀。如下，舉善惡委示，又二；初善，二惡。尋文可解。

In the answer, it first distinguishes them briefly according to their principles. "Yan" is like "all-pervading." Defining lü (Vinaya) as law, the law is an all-pervading formulation that constantly prevents [faults] from arising, without waiting to confront specific events; defining jie (precept) as prohibition, prohibition directly confronts faults, having the prevention and checking [of faults] as its function, which must be based on confronting objects; both have marks, so they are both called deportment (yi). From "As follows" downward adduces the wholesome and unwholesome to explain them in detail, again in two parts: first, the wholesome; second, the unwholesome. One can understand this by examining the text.