acceptance
"Acceptance is the answer to all my problems today. When I am disturbed, it is because I find some person, place, thing, or situation – some fact of my life unacceptable to me, and I can find no serenity until I accept that person, place, thing, or situation as being exactly the way it is supposed to be at this moment...unless I accept life completely on life’s terms, I cannot be happy. I need to concentrate not so much on what needs to be changed in the world, rather as on what needs to be changed in me and my attitudes."
-from the big book