瑜伽論記 14.16

14.16

唯有語音，名語表業者，此簡薩婆多聲即語業，今言但有語音，思業所發名語表業體唯無記，不同小乘業體通三性，唯有發起心造作思名意表業者，此言以思為意業，意業亦發身語以思為業，業即是色而是假名，非別有色名為業等。

Regarding "there are only spoken sounds, which are called vocal manifest action": this excludes the Sarvāstivāda position that sound itself is vocal action. Here it says there are only spoken sounds; initiated by volitional action, they are called vocal manifest action, whose substance is purely indeterminate, unlike the Hinayāna where the substance of the action extends to the three natures. Regarding "there is only initiating mind and formative volition, which are called mental manifest action": this states that volition is taken as mental action; mental action also initiates body and speech, taking volition as action; action is form but is nominally designated, not that there is a separate form called action, etc.