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Baptism opens a window to the heart of Martin Luther’s 16th-century theology. It offers a perspective for how Luther understands the impact of grace and its channels, as well as the nature of justification in an individual’s life. In his teaching about baptism, Luther demonstrates the vital working of the Word and lays a foundation for a Word-centered and faith-oriented spirituality. With baptism, Luther articulates his vision for the purpose of the Church and the rationale for sacraments. Baptism reveals different sides of the theologian: one who argues with a zeal on the “necessity” of baptism and its meaningful God-mandated practice in Christian communities and another who imagines God’s saving grace too expansive to be limited to any ritual. The apparent tensions in Luther’s articulation can be understood from his overlapping agendas and different audiences: in his baptismal talk, Luther is both processing his own Angst about salvation and negotiating his developing position in relation to the medieval sacramental theology and other emerging reform solutions. While feistily refuting his opponents, he is also speaking from his personal religious experience of being as if reborn with the encounter of the Word of grace and passionately extrapolating his most foundational conviction: God’s unconditional promise of grace as the ground of being for human life, given to humanity in the Word. The matter of baptism leads to the roots of different Christian “confessional” traditions. The format of the ritual has generated less anxiety than differing theological opinions on (1) the role of faith in the validity of baptism, and (2) the effects of baptism in one’s life. Whether infant or adult baptism is favored depends on whether baptism is primarily understood as a sign of faith, a cause of forgiveness and transformation, or an initiation into the Christian community—or all of the above. Baptism is at the center of Luther’s theological nervous system; it connects with every other vital thread in the theological map. Baptism is a mystery and a matter of faith; it calls for a philosophical imagination and mystical willingness to grasp the questions of reality beyond what meets the eye. “I study it daily,” Luther admits in his “Large Catechism.” “In baptism, therefore, every Christian has enough to study and practice all his or her life. Christians always have enough to do to believe firmly what baptism promises and brings.”

Crucial for Luther’s theology and his own experience was the question of whether one’s salvation was certain. And the security of the truth which underlay doctrine was complexly related to that question. Luther thus received and developed notions of certitude and security. The concepts as Luther inherited them have a long and somewhat complicated history that can be traced back to ancient Greece. These terms were often distinct throughout antiquity and up to contemporary times. The term “security” has referred to the realm of the political; namely, the security or tranquility of the city state or “nation” both in terms of physical security in times of conflict and also in the history of law. Certitude has a more complex history. For example, Aristotle often understood certainty or akribeia to mean precision, especially in mathematical terms. Those sciences that had the most properties removed (aphaeresis) were the most precise and consequently the most certain. Most prominent in the history of certitudo was the issue of epistemic certainty. Thus we find in Augustine’s doctrine of illumination that uncreated, immutable exemplars were the guarantors of certainty. It was in the later Middle Ages that the issue of epistemic certainty, in the form of mental representation, became a controversial topic. Scotus criticized Henry of Ghent’s views of human cognition and contended that certainty could be had only of self-evident propositions, knowledge of contingent acts, repeated occurrences ordained by God, and sense knowledge of the external world. Ockham argued for epistemic certainty on the basis of self-evident propositions and, most importantly, the reliability of intuitive cognition of individual external objects.

Certainty also had a long history in Christian theology and most often referred to the certainty of faith. Certitude was the conviction of the truth regarding the contents of the faith. Frequently the issue referred to the relationship between faith and reason. Certainty referred primarily to definition of the Christian faith. Not surprisingly, throughout the Christian tradition, certainty was related to the problem of heresy. The early church Fathers tried to establish orthodox doctrine over and against various heretical groups. Everyone agreed that the foundation for Christian truth was Scripture. However, different people interpreted the Bible in ways that were judged to be contrary to Christian faith. Around the year 434, Vincent of Lérins provided a rule that distinguished Catholic truth from heresy. This “Vincentian Canon” required that Christian truth be that which was believed everywhere, always, and by all (Quod ubique, quod semper, quod ab omnibus). These criteria guaranteed the certainty and stability of doctrine. One target of Vincent’s was probably Augustine, because he could be quoted against himself. Due to the many conversions in his life, Augustine made many pronouncements he later retracted, and such retractions were not meant to contribute to uncertainty about the faith. Medieval Scholastic inheritors of Augustine continued to define faith as a cognitive certitude. Their training in dialectic was crucial because it provided the certainty of doctrine against heretics. Luther was trained in dialectic, but in his Disputation against Scholastic Philosophy he opposed the use of Aristotle and logic in theology. Nonetheless, dialectic remained a subject in the university at Wittenberg.

Dialectic could not answer the questions of certainty for which Luther sought answers. His questions were about the certainty of salvation and, for Luther, this certainty could only be found in Scripture and the experience of the Holy Spirit. Such certainty also required a redefinition of faith. As the various reformations continued to divide Western Christendom, controversies about the exegesis of Scripture multiplied both among various reformers and between reformers and Catholics. Throughout the course of the turbulent 16th century, the real source of certainty for all parties became the Holy Spirit.

Throughout the late Middle Ages, certainty and security referred to the relationship between the individual and God. For Martin Luther and the other Protestant reformers, these terms took on a meaning beyond the faithful knowledge of the contents of the faith. Any examination of Luther’s writings show that he used “security” and “certainty” synonymously to refer to the certitude of salvation whereby one experienced the security, assurance, and certitude of God’s benevolent will. Moreover, despite his lack of a firm terminology, Luther meant the same thing by “the certainty of forgiveness,” “the certainty of justification,” and “the certainty of God’s good will,” as well as the phrase, “the certainty of being in a state of grace.” All of these phrases referred to the certainty of salvation or the security of knowing that God’s benevolence was directed to one’s own individual salvation.

Martin Luther was not an original contributor to the study of cosmology, and if one were to judge only by his explicit remarks on the matter, it would seem to have been of little interest to him. He was, however, every bit a man of his times, and as such he assumed what educated people of his times assumed, including in the matter of the nature and structure of reality. The world in which he came of age was informed by a compelling vision of the universe as a whole. Astronomical observation and mathematical calculation in the traditions of Aristotle and Ptolemy had long since combined with philosophical and religious speculation to render Luther’s world a coherent “cosmos” (Gk. kosmos, “order” or “world”), at the center of which reposed a stationary sphere, the earth. This world was surrounded at ever-increasing heights by the heavenly spheres, each of them thought to be wheeling in at tremendous rates of speed that increased as one moved up through their heights: first the moon, then the planets, the stars, and ultimately the prime mover. This long-traditional view of the cosmos rendered reality itself an arena of intense motion and beauty.

Taken in a broad scientific and aesthetic sense, cosmology provided not only an interpretation of the heavens but also an imaginative lens through which to experience and understand one’s self and one’s world. Though he quibbled over some of the details, Luther clearly viewed himself and his world through that very lens. During his university studies in Erfurt for the bachelor and master of arts degrees, he read cosmology as a subject covered in the integrated approach to learning set forth in a curriculum based on the trivium (grammar, rhetoric, and dialectic) and quadrivium (arithmetic, geometry, astronomy, and music). In combination with other later medieval notions—such as the understanding of the human body and its four humors or the sublunar sphere and its four constituent elements (earth, water, air, fire)—cosmology became for Luther what it was for all his educated peers, that is, a world view. Thus, while Luther was not a cosmologist per se, the Aristotelian-Ptolemaic cosmos provided a set of background beliefs that informed his theology and world view at every level. He also developed a distinctive understanding of the reality and exercise of power and authority, both on the earth and in the heavens.

Martin Luther and Desiderius Erasmus played somewhat significant roles in each other’s lives. Their early relationship is not free from a sense of the serious differences that divided them, but it largely reflected their common commitment to the biblical humanist ideas of “back to the sources” and effective rhetoric. Erasmus’ need to demarcate his positions from those of the heretic and outlaw after 1521 strengthened his resolve to demonstrate publicly at least one important difference between them, resulting in his Diatribe (1524), which provoked a debate with Luther over the freedom or bondage of the will, which Luther treated in his De servo arbitrio (On Bound Choice, 1525) and commentary on Ecclesiastes (1526/1532).

Martin Luther’s insistence on the proper distinction between law and gospel in theology marks one of his most important contributions to the Reformation movement and subsequent Protestant theology. In particular, it played the critical role in Luther’s “breakthrough” by which he came to his understanding of God’s righteousness and his justification of the sinner. The distinction between law and gospel served at least two key functions in his thought. First, it kept the story of Christ focused on the benefits to people achieved by his death and resurrection. In this way, it magnified Christ’s work in accomplishing a person’s justification. As a corollary, it provided consolation to Christians struggling with the burden of their sins. Second, the distinction of law and gospel served as a hermeneutical tool for pastors not only to interpret the scriptures in line with their purpose, but also to apply the scriptures in a pastoral way to the lives of their people in order to comfort them and to strengthen their faith. Luther’s distinction of law and gospel raised questions for his followers regarding the law and whether or not it had any positive role to play within the Christian life.

Luther’s distinction between law and gospel is closely related to several other distinctions in his theology. First, it bears a number of similarities with Luther’s distinction of the two kinds of righteousness. But whereas the latter focuses on a description of anthropology, law and gospel focuses on the works of God by which he brings about two kinds of righteousness in the life of a person. Second, law and gospel is also related to Luther’s distinction of the two realms. But whereas the latter focuses on how God rules with his left hand for the well-being of creation and with his right hand for the well-being of the church, law and gospel deal with the two works of God by which he brings about his goals for creation and the church. In the centuries since, scholars have debated aspects of Luther’s distinction, particularly as it impinged on the understanding of the third use of the law.

Martin Luther’s view of emotions is firmly based on traditional language. He prefers to use affect as a general term for emotional phenomena, which includes general inclinations of love and hate, which involve more incidental emotions such as joy and fear. In general terms, emotions always have a cognitive content, although they are for Luther more than mere cognitions. In some cases, Luther even enjoins a cognitive manipulation of unwanted emotions, using traditional forms of piety, such as meditation on Christ’s sufferings. In the healing of emotions both in the spiritual and in the natural realm, music has a prominent place for Luther. The main cognitive source of spiritual emotions for Luther is the Word of God, dispensed by God himself in the scripture as the supreme rhetorician. Luther also noted the social nature of emotions. In particular, he appreciated the innate emotional bonds between the members of the family as God’s means for securing the well-being of humankind. The emotions are so deeply embedded in human nature that all the saints and even Christ himself were not without them. Luther’s ideal is not Stoic apatheia, but rather a moderation of emotions. Luther seldom attributes genuine emotions to God. He considers biblical language on God’s anger as pointing to his future judgment rather than any present state of mind. Luther intimately connects faith, which grasps the promises of the Gospel and creates the certainty of salvation, with human emotional life. This has a double effect on the emotions, providing comfort against the fear caused by sinfulness and external adversities as well as creating spiritual joy and peace of mind. Fear of God is an ambiguous emotion for Luther. The right kind of fear connected to reverence is essential to Christian life, and a similar fear should be felt for parents and authorities. Faith creates joy, which drives away fear, but the remaining sinfulness means that a certain amount of fear remains in this life. Fear and joy are dynamically complementary in Luther’s view, and he accuses his adversaries of preaching false security, which gets rid of the fear by denying the inherence of sin and mortality in human life. As with emotions, Luther adopts the traditional terminology of experience but develops it in a creative manner. Experience of God’s both negative and positive presence is essential for theology, especially for understanding the true meaning of the scriptures. However, in comparison to scripture, experience is insufficient in spiritual matters.

The structures of the late medieval Church into which Martin Luther was born and within which he received his education and theological training were complicated, particularly in the German lands. German bishops were territorial princes as well as spiritual leaders. Only a minority of German dioceses fell within temporal territories, but in most cases dioceses spanned several territories and some territories included areas in two or more dioceses. Abbots and abbesses were also rulers of independent territories, many of which answered only to the pope. Germany’s prince-bishops had considerable political power, exemplified in the college of electors who selected the Holy Roman Emperor. Of these seven, four were temporal political rulers: the King of Bohemia, Margrave of Brandenburg, the Count of the Palatine, and the Duke of (Electoral) Saxony; but the remaining three were Germany’s three Archbishops: of Cologne, of Mainz, and of Trier. Although such high-ranking church posts were not hereditary, the candidates for most German bishoprics were required to come from the high nobility, and many bishoprics effectively passed down families, or alternated between two families. The Archbishopric of Magdeburg, for instance, was generally held by a scion of the families of the Electors of Saxony and of Brandenburg. In addition, temporal rulers could hold and exercise spiritual power. Thus in Wittenberg, the Elector of Saxony claimed spiritual jurisdiction over the castle church and later over the town, and this was ceded by the Archbishop. In consequence, long before the Reformation, bishops and rulers were vying for authority and sometimes for territory. Not all ecclesiastical power was mediated through bishops: the Abbesses of Essen and Quedlinburg, like some abbots held their jurisdiction directly from the Pope. The German churches which emerged in the course of the Reformation were deeply influenced by their local contexts and by the patterns of relationship between the bishops and temporal political authorities, which in turn shaped emerging Reformation church orders.

In analyzing the role of gift and giving in Martin Luther’s theology, one almost inevitably has to deal with the contrast between Marcel Mauss’s description of archaic gift economy, where gifts and exchange are interconnected and gift exchange a total social fact, and Derrida’s critique of Mauss for talking of anything else but the gift, since only a gift uncontaminated by exchange deserves the proper name “gift.” Accordingly, any reading of Luther relating Luther’s theology to the reciprocity of giving seems, from the outset, to grasp anything but the cornerstone of his theology: the justification by faith alone apart from works of the law. Nevertheless, scholars in the early 21st century have been discussing Luther as a theologian of the gift. Some defend a position according to which Luther’s theology can only be rightly understood by maintaining that the divine gift is free and pure. Others argue that Luther’s mature theology allows for an integration of some kind of exchange as a vital part of the very doctrine of justification.

In both cases, social anthropological gift studies can function as a lens for highlighting the heart of Luther’s theology, either negatively by presenting the absolute opposite of Luther’s understanding of divine giving in justification and creation or positively by revealing the very heart of the same. The young Luther vehemently criticized a piety regulated by economic principles and understood divine righteousness in contrast to human principles for righteousness. However, he soon began integrating reciprocal aspects from the traditional definition of righteousness into his doctrine of justification. This was possible due to an emphasis on the divine self-giving, revealed in Christ and slowly elaborated to cover Luther’s understanding of the whole Trinity. In this move, Luther seemed to have been influenced by Roman popular philosophy, which was widespread in the late renaissance, but biblical passages emphasizing reciprocal justice also played an important role. Advocators for understanding Luther’s theology from the perspective of inter-human gift exchange will argue that Luther’s theology of the gift is intimately related to his use of the figure of communicatio idiomatum, which allows the giver to share his attributes with the receiver.

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.

Luther’s understanding of the Incarnation concerns various subject areas in his theology, among them his understanding of scripture, his teaching on the sacraments in particular, as well as his description of a human being’s life of faith. All these subject areas are based on Luther’s Christology, which is essentially determined by his insights into the Incarnation and the humanity of God in Jesus Christ.

Luther’s description of the Incarnation and the humanity of God is particularly oriented towards the creed of Chalcedon. The insight that Christ is at the same time true human and true god is something Luther holds as relevant to salvation. For this reason, it is important for him on the one hand to think about the Incarnation of God in a Trinitarian context and thereby to highlight Christ’s divine existence. On the other hand, he refers to the concept of the Virgin Birth in order to show that God was born a real human being. Luther describes the union of God and man in Christ principally as a reciprocal exchange of the respective divine and human characteristics. He uses the figure of the communication of properties (communicatio idiomatum) to highlight the Incarnation’s fundamental significance for salvation, which becomes manifest in the course of Christ’s life.

Luther’s conception of the fact and manner in which human and divine natures are united with each other in Christ is of soteriological relevance. With the incarnate God, the sin that Christ has taken upon himself for the salvation of humankind is defeated on the Cross, since by virtue of his human nature the characteristics of being able to suffer and to die were proper to the incarnate Son of God. Accordingly, God himself suffers and dies on the Cross in Christ for his own creatures under the burden of their sins. On the Cross, the God who died in Christ and with his resurrection has overcome the death of sin meets his creatures so that they attain faith and ultimately eternal life in community with God. This saving event is, according to Luther, founded in God’s immeasurable love.

The saving effectiveness of Incarnation, Cross, and resurrection presupposes Christian proclamation, according to Luther. The preaching of the incarnate God is needed, so that through the operation of the Holy Spirit the truth of the proclaimed event can be recognized and faith can thereby arise. In faith in the Son of God who has become man, the believer himself experiences a most intimate connection with Christ. According to Luther, this community of faith determines the consummation of the life of the believer, who therefore lives in love for God and for neighbor because the love of God has been revealed to him/her in Christ.

The community of Christ’s faithful with one another is, according to Luther, above all formed through the celebration of the sacraments. In celebrating them, the believers experience the real presence of the incarnate God in Christ, through whom they are bound in faith based on the communication of properties between the human and divine natures.