四分律刪繁補闕行事鈔 1.179

1.179

夫事生不意，法出恒情；故對情而順其心，心順則於法無失，故名欲也。然則情事相反，故立法以撿之；撿則有事必明，若明故對門而辨。初明其緣，後明欲法。初中有三：一制意、釋名、明體。二有開遮。三定緣是非。

Matters arise unpredictably, and legal norms deviate from constant emotional inclinations; therefore, one faces the inclination and accords with the mind; when the mind is in accord, there is no error regarding the Dharma, hence it is called chanda ('consent' or 'desire'). However, feelings and affairs run contrary to each other, so legal measures are established to examine them; when examined, any affair will certainly become clear; since it is clear, it is discriminated against specific categories. First, the conditions are clarified; afterwards, the procedure of chanda is clarified. In the first part, there are three sections: 1. The intent behind the institution, explanation of the name, and clarification of the essence. 2. Allowances and prohibitions. 3. Determining the propriety or impropriety of conditions.