金剛經纂要刊定記 2.177

2.177

答：「行蘊遷流逼迫常苦，但以苦樂麁相所覆，常情不知此微細苦。故此三法俱名苦也。」

Answer: "The saṃskāra aggregate's ceaseless flux and oppression is constant suffering; yet, covered over by the coarse marks of suffering and pleasure, ordinary perception does not recognize this subtle suffering. Therefore, all three dharmas are called suffering."