瑜伽論記 7.114

7.114

於中有三：一、攝八為三，謂由生等異門，唯顯了苦苦等者，景云：由約異門故前七苦唯顯苦苦，以因生等多增苦受故。

Therein are three parts: first, subsuming the eight into three. Regarding 'through different designations such as birth, only the suffering of suffering is revealed, and so forth': Jing says that because of the distinct designations, the first seven sufferings only reveal the suffering of suffering, since causes such as birth mostly increase painful feeling.