What is sanity

I would often hear in my AA meetings that insanity is doing the same thing over and over and expecting different results. I was still doing this about a problem with overeating nearly 30 years after I stopped drinking.  But I can’t recall anybody saying what sanity is.  I knew it could also be called mental health.  When I lived in Japan, I found that the Japanese word for what we call a mental hospital could be translated as “spirit hospital,” so I suppose sanity could also be called spiritual health, as it is more a matter of spirit than intellect.