Johannes Grössl is Assistant Professor for Fundamental Theology and Comparative Studies of Religion at the University of Würzburg, Germany. He has published in Faith and Philosophy and Theology and Science and co-edited a volume of German translations of essays on divine foreknowledge and human freedom, Göttliche Allwissenheit und Menschliche Freiheit, 2015.

Klaus von Stosch is Professor for Systematic Theology at te University of Paderborn, Germany. He is an internationally well-known expert in comparative theology, having published 11 monographs and 40 edited books, among them, together with Francis Clooney, How to do Comparative Theology? He has held guest professorships in Jerusalem and research fellowships at the University of Qom (Iran), Harvard Divinity School, and Georgetown University.

Part I Was Christ Sinless? Exegetical and Historical Approaches 1 The Sinlessness of Christ and Human Perfection 2 Sinless or Not? The Baptism by John and Jesus' Consciousness of his Personal Sins 3 "He Himself Was Tempted" (Hebr 2:18): The Temptation of Jesus in the New Testament 4 God's Work and Human's Contribution: Jesus' Sinlessness in Theodore of Mopsuestia's Christology 5 Conciliar Christology, Impeccability, and Temptation Part II Is Christ Impeccable? Systematical Approaches 6 Seven Questions Ingredient to Jesus Christ's Temptation 7 The Hypostatic Union and the Freedom of Christ 8 Classical Theism, Christology, and the Two Sons Worry 9 Peccable as Son of Man, Impeccable as Son of God: An Attempt to Reconcile Freedom and Impeccability 10 The Divine and Human Will of Christ 11 Deification and the Divided-Consciousness-View Part III Human Perfection and Sinlessness in Islamic Theology 12 The Scope of 'I¿ma and Qur'anic Evidence 13 Inerrancy and Exaggeration in Shi'I Theology 14 The Theological Concept of Imamate: How Imamis Reconcile Human Perfection and Free Will