The Purpose of this study is to examine the process of change in the level of differentiation of self through the narrative of David and Bathsheba and to find implications for Christian counseling. The way of study in this research was carried out collectively through intra–disciplinary integration of Bowen’s family therapy and actual events told in the Bible. The research findings are, first, King David had a high level of basic differentiation of self in the range of 85 to 95. Second, King David had a low level of functional differentiation of self because he suffered from anxiety about loneliness and a sense of emptiness from the temporary triangle (David – adultery – remnant of family) combined with sexual immorality, confusion in power, and murder. Third, through God’s therapeutic intervention, David was able to quickly repent and recover the same level of differentiation of self. David’s level of functional differentiation of self was changed by resulting in quick repetitive movement in his emotional system. Also, temporary fusion relationship by power and adultery was changed through the therapeutic triangle. This brought about the recovery of David’s basic differentiation of self. In conclusion, this study shows that people with high level of basic differentiation of self can, depending on the situation, show a low level of functional differentiation of self. Not only non–Christians but devout Christian believers, who are going through sanctification, need to work on their psychological maturity.