瑜伽師地論分門記 2.183

2.183

別釋分十中第四明觀法性行。無常性分三。一問。二答分二。一明未合。二明當合。三結　別釋分十中第五明觀合會行無常性分三。一問。二答。三結。

Within the specific explanations divided into ten, the fourth is explaining the observation of the aspect of reality (dharmatā). The impermanent nature has three [sections]: 1. inquiry; 2. answer, which has two [subsections]: (1) explaining that they have not yet met, (2) explaining that they are bound to meet; 3. conclusion. Within the specific explanations divided into ten, the fifth is explaining the observation of the impermanent nature of the aspect of convergence, having three [sections]: 1. inquiry; 2. answer; 3. conclusion.