成唯識論演祕 7.352

7.352

答：異類親因理誠未可，增上相發，麁引妙生，於理何失？如漏、無漏，許相導故。故《瑜伽論》七十三云：問：若先無有知無相智，由無有故，亦無熏習。既無其因，應不得生。

Answer: While it is indeed inadmissible in principle for different categories to act as direct causes, what error is there in principle if they stimulate one another through sovereign condition, so that the coarse induces the arising of the subtle? Just as contaminated and uncontaminated [states] are accepted as guiding each other. Hence the Yogācārabhūmi, fascicle seventy-three, states: Question: If there were no prior knowledge of the signless, then because it does not exist, there would also be no perfuming. Since it lacks a cause, it should not be able to arise.