“In What Sense Is Life Suffering?”:
[M]ental valence works like temperature.
[S]cientifically (according to the Buddhists) there’s only one kind of emotion: suffering. Apparent neutral is a fact about human perception with no objective significance. If you start at “very bad” and take away suffering, at some point your perception switches from “less suffering” to “more joyful”, but you’ve just been taking away suffering the whole time. The real “zero suffering” isn’t neutral / blah / just okay. It’s nirvana, which feels more blissful than we can possibly imagine.