Not just the 4th step delves into the past and exposes our defects of character which hinders our emotional and spiritual growth; but the 8th step digs even deeper:
"Though in some cases we cannot make restitution at all, and in some cases action ought to be defeered, we should nevertheless make an accurate and really exhaustive survey of our past life as it has affected other people. In many instances we shall find that though the harm done others has not been great, the emotional harm we have done ourselves has. Very deep, sometimes quite forgotten, damaging emotional conflicts persist below the level of consciousness. At the time of these occurrences, they may actually have given our emotions violent twists which have since discolored our personalities and altered our lives for the worst.
"While the purpose of making restitution to others is paramount, it is equally necessary that we extricate from an examination of our personal relations every bit of information about oursleves and our fundamental difficulties that we can. Since defective relations with other human beings have nearly always been the immediate cause of our woes, including our [addiction], no field of investigation could yield more statisfyng and valuable rewards than this one.* Calm, thoughtful reflection upon personal relations can deepen our insight. We can go far beyond those things which were superficially wrong with us, to see those flaws which were basic, flaws which sometimes were responsible for the whole pattern of our lives. Thoroughness, we have found, will pay--pay handsomely."
Twelve Steps and Twelve Traditions, Step 8, page 79-80