成唯識論演祕 6.408

6.408

詳曰：論同聚下至淨八來，皆依時同，同聚四分而明緣義，不障前後自類三分為開導也。三分既於一識義分，義互開導相應無過，言論不許恐失論旨。

We comment: From the Treatise's 'concomitant' downward to the arrival of the pure eighth, all are based on the four parts belonging to the same collection at the same time to clarify the meaning of condition; it does not preclude the three parts of the same category, prior and posterior, from opening the way and guiding. Since the three parts are conceptually distinguished within a single consciousness, their conceptually opening the way and guiding one another corresponds without fault; to say that the Treatise does not allow it is, I fear, to lose the intent of the Treatise.