This article brings up some interesting ideas in modern psychology, which may be helpful for thinking about "two feelings: pleasure and pain". The article talks about nuetral affect (a long article and haven't read it all yet).
Does Neutral Affect Exist? How Challenging Three Beliefs About Neutral Affect Can Advance Affective Research
Researchers interested in affect have often questioned the existence of neutral affective states. In this paper, we review and challenge three beliefs that…
www.frontiersin.org
