This prayer suggests to me that I need to take an inventory of everything going on in my life and act on what I can and not let the things I can't control be a hinderance to me. Also , I need to acknowledge to God that there are things I can't control and depend on Him to take care of them. This will free me to have the peace He has intended for me and be a person that He can more fruitfully use . And nothing is more impotant than the later.
God bless you , my friend