瑜伽論記 5.233

5.233

因果相似者，善因樂果惡因苦果，能成所成展轉相似。邁云：自世親前則以瓶等物體為喻，無常同聲故名為同類，從陳那後瓶之與聲既全殊，況亦四塵一塵何成同品，故瓶無常與聲無常義有均等，故名同品。

Regarding "similarity of cause and effect": wholesome causes bring pleasant results, and unwholesome causes bring painful results; the probans and the probandum are mutually similar. Mai says: Prior to Vasubandhu, material objects such as pots were used as examples: because they are impermanent, like sound, they were called "homogeneous instances" (sajāti). Since Dignāga, however, pots and sound are completely distinct; moreover, how could four dust-particles and one dust-particle constitute a homogeneous class (sapakṣa)? Therefore, it is because the meaning of the pot's impermanence and sound's impermanence are equal that they are called "homogeneous classes."