大乘義章 1.42

1.42

問曰：因緣是生死法，云何能與涅槃作因？釋言：因緣真妄集成，攝緣從妄，妄心所為虛誑無法，不名佛性。攝緣從實，皆真心作。故《地經》言「十二因緣皆真心作。」由真作故，窮之得實，便名涅槃。故得為因，因故名性，義如前釋。

Question: Dependent origination is a dharma of saṃsāra; how can it act as a cause for nirvāṇa? Explanation: Dependent origination is gathered and formed by the true and the deluded. Subsuming conditions under the deluded, it is what is made by the deluded mind, an unreal and deceptive non-dharma, and is not called Buddha-nature. Subsuming conditions under reality, it is entirely made by the true mind. Hence the *Daśabhūmika Sūtra* says: 'The twelve links of dependent origination are all made by the true mind.' Because they are made by the true, when one penetrates them and attains reality, it is then called nirvāṇa. Therefore it can serve as a cause, and because it is a cause it is called 'nature,' the meaning of which is as explained before.