四明十義書 1.92

1.92

今就上人邪說，用正義示之，幸請尋省。非染非淨真心者，不思議境也。能成淨緣，十乘妙觀也。佛界心者，妙觀之果，常住陰也。能熏染緣，無始無明也。九界心者，無明之果也，生死陰也。生佛雖各由緣，而染緣所成本有。

Now, addressing your heterodox explanation, Venerable Sir, I shall demonstrate it with correct doctrine; I invite you to examine and reflect on it. The true mind that is neither defiled nor pure is the inconceivable object. That which is capable of achieving pure conditions is the wondrous contemplation of the ten vehicles. The mind of the Buddha realm is the fruit of the wondrous contemplation, the permanently abiding aggregate. That which can perfume defiled conditions is beginningless ignorance. The mind of the nine realms is the fruit of ignorance, the aggregate of birth and death. Although sentient beings and the Buddha each depend on conditions, that which is formed by defiled conditions is fundamentally possessed.