大乘起信論義記 3.43

3.43

Second, in explaining 'conjoined' and 'unconjoined', among the six defilements the first three are conjoined mind. 'Conjoined' has two explanations. First, explaining in terms of the mind and mental factors: because these three kinds are all coarse minds. 'The dharmas of mind and mental factors are different': 'mind' refers to the king of the mind, and 'mental dharmas' refers to the mental factors; the king and the factors are not identical, hence they are called 'different'. In the *Kātyāyanaśāstra* they are called 'mind and the dharmas of mental factors'. 'Based on the differentiation of defilement and purity': this is the discriminated objective realm. 'Their aspects of knowing and aspects of objective support are identical': if the king of the mind knows defilement, the mental factors are also the same; if the king of the mind takes purity as its objective support, the mental factors are also the same. The aspect of knowing means the cognizer is identical; the aspect of objective support means what is cognized is identical. Second, explaining in terms of the conjunction of mind and realm: because these three kinds arise based on objective realms, they are subsumed under the six marks arisen based on objective realms in the text above. As the text below states: 'Because objective realms are extinguished, the conjoined mind is extinguished.' 'The dharmas of mind and mental factors are different': 'mind' refers to the cognizing mind, 'dharmas' refers to the cognized sense-dust of dharmas, and 'different' means that mind and realm are not the same. 'Based on defilement and purity... identical': it means conceiving an understanding of defilement regarding a defiled realm, and conceiving an understanding of purity regarding a pure realm, hence it is said to be 'identical'.