It's hard to find that balance with bipolar disorder, although periods of normal mood states do occur naturally. I think stability is where you can describe your typical mood as "good" or "fine," yet at times you still experience slight mood shifts in response to environmental triggers. The moods are mild, not extreme like we so often experience. You also wouldn't get carried away in either direction. For me, I know my mood is on the milder side when coping strategies help to alleviate it. More elevated mood changes are difficult to control without medication and tend to stick around longer.