成唯識論述記 3.303

3.303

述曰：第二癈立也。因緣生者，謂由先業及名言實種，即要有力，唯任運心，非由作意，其心乃生，即五、八識隨其增上異熟因為緣，名言種為因，故變於境。八俱五數，即無勝力，設任運生，境無實用，因緣變法，必有實體，非橫計故，非無用故。

The Commentary states: This is the second [part], discarding and establishing. 'Produced by causal conditions' means: produced by prior karma and real nominal seeds, that is, they must have efficacy; only a spontaneous mind, not one produced through mental application, then that mind arises; that is, the five consciousnesses and the eighth consciousness, in accordance with the sovereign conditioning of their vipāka cause and having nominal seeds as their cause, transform the object. The five mental factors associated with the eighth lack superior efficacy; even if they arise spontaneously, their objects have no real utility. Phenomena transformed by causal conditions must have real substance, because they are not arbitrarily imputed and are not without function.