Tim Keller has an eye opening article on this subject in the Reedeemer Report (March 2007). I especially like his point that one can "mistake the operations of your spiritual gifts for the operation of spiritual grace in your life" (page 1) the danger being that:
we can look to our ministry activity as evidence that God is with us, or as a way to earn God’s favor and prove ourselves. If our heart remembers the gospel, and is rejoicing in our justification and adoption, then our ministry is done as a sacrifice of thanksgiving —and the result will be that our ministry is done in love, humility, patience, and tenderness. But our heart may be continuing to do the same self-justification it has always done—seeking to control God and others by earning and proving our worth—through our ministry performance (page 4).For more Tim Keller Resources and links to articles such as these go to this site.