My favorite passage of scripture on Character development is II Peter 1:3-11.  It is worth noting that much of what is popular out in culture ends with "Faith or Confidnece" as the end goal... when actually that is only the beginning of growing in character.  Much of the wounding in religious communities comes from a core lack of humility in our culture.  Confidence or Faith not brought into maturity by discipline and action.  It is interesting to note how concerned the Apostle Peter was about this before he was martyred.   See Peter's emphasis on this in verses 12-15.  Who we are is what we live on the inside 24 hours a day 7 days a week.  Growing on the inside is learning to have a life.