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.Systematic theology as a discipline of Christian theology formulates an orderly, rational and coherent account of the Christian faith and beliefs. Systematic theology draws on the foundational sacred texts of Christianity, while simultaneously investigating the development of Christian doctrine over the course of history, particularly through philosophical evolution. Inherent to a system of theological thought is that a method is developed, one which can be applied both broadly and particularly. Systematic theology will typically explore God (theology proper), the attributes of God, the Trinity as espoused by trinitarian Christians, revelation, biblical hermeneutics, the creation, divine providence, theodicy, anthropology, hamartiology, Christology, pneumatology, soteriology, ecclesiology, missiology, spirituality and mysticism, sacramental theology, eschatology, moral theology, the afterlife, and the Christian understanding of other religious systems and philosophies.Christian theology has permeated much of Western culture, especially in pre-modern Europe.