Although broad measures have revealed relationships between spirituality and other psychological variables, the exact nature of these remains unclear. Further, many measures fail to consider values significant to practitioners of faith and of psychology. The purpose of this study was to formulate a measure of spiritual maturity that took into account both the beliefs of Christian participants and indices of behavioral health considered important to secular psychologists. Employing the expertise of two sets of subject matter experts, first to construct items and then to evaluate their face validity, resulted in 42 items comprising two subscales of the new Christian Maturity scale based upon Clairvaux (n.d.): Loving God for Self's Sake and Loving God for God's Sake. The items were administered along with multiple construct validity indicators to 541 young adults enrolled in a private Christian university. Item analysis revealed large inter-item correlations. Ten items were retained for each of the two subscalesSchool of Teaching and Curriculum Leadershi