成唯識論演祕 3.446

3.446

此隨轉門，故《俱舍論》第十云，三和有三：一、同在一世，故名三和。二、因果相順，不相違返，故名三和。謂根與境雖在過、未，識居現在，因果義成。三、互相隨順，同得一果。謂根、境、識雖各一世，同一觸果故名和合。初之一義依五識說，後二意識。

This is a provisional pedagogical method. Therefore, the Abhidharmakośa-bhāṣya, fascicle 10, states that the 'harmonious combination of the three' has three meanings: First, being together in the same temporal period; hence it is called the harmonious combination of the three. Second, cause and effect harmoniously accord and do not oppose each other; hence it is called the harmonious combination of the three: that is, although the sense faculty and sense object are in the past or future, the consciousness resides in the present, so the causal relationship is established. Third, mutually according with each other, they jointly obtain a single fruit: that is, although the faculty, object, and consciousness each belong to a single period, they share the single fruit of contact; hence it is called harmonious combination. The first of these meanings is stated in terms of the five consciousnesses; the latter two are in terms of the mental consciousness.