'"Is it I?" is the best question that any disciple can ever ask when Jesus warns about sin, when any church discipline takes place, whenever we hear about the sin committed by anyone else. As we turn the pages of our hearts over against the pages of the Bible each morning, we ought to ask, "Is it I?" These three words reveal the heart of true believers, who know they are capable of any imaginable sin and that it is only Christ's saving grace indwelling them that reveals the truth about them and their desires. "Is it I?" are the assembled words by which the believer discovers himself - the condemning nature of his sin, the recreation of self in Christ.'
Rosaria Butterfield, The Gospel Comes with a House Key, p.139.
