Four classes of first-grade children at a Christian school took pre- and post-tests measuring humility. Two intervention classes had devotional lessons on humility and two comparison classes did not. For one week, devotional lessons featured humility-related children's literature, cognitively appropriate discussions, writing about humility, and teacher-reinforced behaviors of humility. Intervention classes showed a slight increase in humility relative to comparison classes. After statistical control for personality traits of Agreeableness and Conscientiousness, increases in humility disappeared; personality could be a mediator of humility assimilation. This research provides feasibility of teaching and measuring humility in young Christian school children.