The principle behind Step Nine is Self-discipline.
Page 76 in the Big Book
Now we need more action, without which we find that "Faith without works is dead." Look at Steps Eight and Nine. We have a list of all persons we have harmed and to whom we are willing to make amends. We made it when we took inventory. We subjected ourselves to a drastic self-appraisal. Now we go out to our fellows and repair the damage done in the past. We attempt to sweep away the debris which has accumulated out of our effort to live on self-will and run the show ourselves. If we haven't the will to do this, we ask until it comes. Remember it was agreed at the beginning we would go to any lengths for victory over alcohol.