大般涅槃經義記 5.116

5.116

第二辯中，先辯三受，「所謂苦、樂、不苦不樂」列其名字。逼惱名苦，適悅名樂，中容受心不同前二名不苦不樂。又，捨前二亦得名捨，此三心法納境稱受。

In the second part, distinguishing [them], he first distinguishes the three feelings: "namely, suffering, pleasure, and neither-suffering-nor-pleasure" lists their names. Oppressive affliction is called suffering; pleasant delight is called pleasure; an intermediate receptive mind that differs from the previous two is called neither-suffering-nor-pleasure. Furthermore, relinquishing the previous two can also be called equanimity. These three mental dharmas, by taking in sense-objects, are called feeling.