大乘百法明門論開宗義決 1.83

1.83

異類而熟者。由異性因異性果熟。謂諸種子復有二種。一者異熟。即是所熏善惡二種。此望第八無記種子而為因性。若無此種第八種子必不生故。二者名言。即通一切三性種子。各能親辨自所生果。各望自果為因緣性。由善惡種令第八識名言種熟生五趣果。故善惡種名異熟因。是故說名由異性因異性果熟名為異熟。

Regarding "maturing as a different class": The maturation of an effect of a different nature results from a cause of a different nature. Seeds are furthermore of two kinds: First is vipāka [seeds], which are the two kinds of wholesome and unwholesome [seeds] that have been perfumed. Relative to the indeterminate seeds of the eighth [consciousness], these serve as the causal nature; for without these seeds, the seeds of the eighth [consciousness] would definitely not arise. Second is conventional designation (nāmasaṃketa) [seeds], which pervade all seeds of the three moral natures; each can directly generate its own produced effect, and relative to its own effect, each serves as the nature of the causal condition (hetu-pratyaya). Wholesome and unwholesome seeds cause the conventional designation seeds of the eighth consciousness to mature and produce the effects of the five destinies (gati); therefore, wholesome and unwholesome seeds are called vipāka-hetu. For this reason, it is said that the maturation of an effect of a different nature from a cause of a different nature is called vipāka.