Luther’s understanding of God saturates his oeuvre, and in turn, this understanding is saturated by his doctrine of the justification of the sinner. God is the sovereign source and origin of all that is, and Luther develops his understanding of God in a manner that tries to safeguard this position in such a way that the personal relationship to God becomes the focus point for all he says. The doctrine of God as creator and as savior is modeled in a parallel way in Luther, as he sees God as the source of everything positively in both contexts. God is the sole giver of the gifts that human life requires. As creator, God is omnipresent, omniscient, and sovereign. Nothing can determine God. God is accordingly also the only instance in reality that has free will. Everything else is dependent on God, God’s foreknowledge, and God’s predestination. It is possible to see Luther’s position as an attempt to offer the human being a reliable and trustworthy notion of God, someone he or she can cling to in times of despair and desolation. The only God who deserves to be God, who is trustworthy with regard to being able to provide a safe and reliable basis for human life, is the God who justifies the sinner because of God’s own righteousness. In contrast, a human who puts her trust in herself and her own works or merits makes herself a god and will not be able to stand justified coram deo in the last judgment. Luther develops the idea about God’s hiddenness in different ways, most notably in his ideas about the hidden God in De servo arbitrio. But also in his notion of the theology of the Cross in the Heidelberg Disputation, and in other places where he writes about the masks of God, behind which God hides in order to do God’s work, we can see related or similar ideas. Thus, Luther develops an ambiguous element in his understanding of God.