Sleeping normally. Enjoying things. Enjoying food but not obsessing about it. Smiling when one sees a kitty and being healthily angry over issues that should make you angry (if kitty playing with a flower and war in Syria make you feel the same emotion - blah - that is not stable). Stable is also not chronically bored or unchanging.
interesting take on stable as a goal:
Why ?Stabilizing? People is Entirely the Wrong Idea | Mad In America
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