Christian spirituality draws strongly on the Bible. Yet, it is the New Testament that almost without exception features most prominently. Ten possible reasons are offered why the Old Testament takes on such a disproportionately diminutive role in the practice and study of spirituality: Textual complexity/critical scholarship/theological educa-tion; Modern popular pieties; The cultural gaps between the Old Testament worlds and our worlds; Theological difficulties/Christian sensibilities; Fear of “boundary-less” interpretations; The reference to Scripture by writers on spirituality; The notion of progressive revelation; Theological diversity within the Old Testament; OT : NT = law : grace; The long and the short of textual units