Part I: Faith and Spirit. The foundation of belief today experience of the spirit and existential commitment religious enthusiasm and the experience of grace anonymous and explicit faith. Faith between rationality and emotion. Part II: Spiritual Theology in Christian Tradition. The spiritual senses according to Origen the doctrine of the spiritual senses in the middle ages. Modern piety and the experience of retreats reflections on a new task for fundamental theology. Part III: Listening to Scripture. The acceptance in faith of the truth of god the old testament and Christian dogmatic theology on the history of revelation according to the second Vatican council the one Christ and the universality of salvation. Part IV: Questions about God. The hiddenness of God an investigation of the incomprehensibility of God in St. Thomas Aquinas the mystery of the Trinity.