From the AA Big Book:
And 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.
Nothing, absolutely nothing, happens in God’s world
by mistake.