Christian theology is the study of Christian belief and practice. Such study concentrates primarily upon the texts of the Old Testament and the New Testament as well as on the historic traditions of Christians. Christian theologians use biblical exegesis, rational analysis and argument. Theology might be undertaken to help the theologian better understand Christian tenets, to make comparisons between Christianity and other traditions, to defend Christianity against objections and criticism, to facilitate reforms in the Christian church, to assist in the propagation of Christianity, to draw on the resources of the Christian tradition to address some present situation or need, or for a variety of other reasons.