瑜伽論記 7.199

7.199

如順樂受觸，如是順苦受觸，順不苦不樂受觸，為緣所生不平等受，受所攝等者，不平等受即是苦受，俱非即是捨受，下顯身心三中苦捨可知。

In 'just as contact conducive to pleasant feeling, so too contact conducive to painful feeling and contact conducive to neither-painful-nor-pleasant feeling, as condition for the arising of unharmonious feeling, comprised by feeling, etc.': unharmonious feeling is painful feeling; neither is neutral feeling. Below, painful and neutral feelings among the three bodily and mental [feelings] can be understood.