Few theological questions reach more deeply into our understanding of sin, grace, responsibility, and salvation than the freedom of the human will. People plainly make choices, and Scripture addresses them as responsible creatures. The controversy begins when we ask a more precise question: What can the fallen will do in relation to God? Is it able to turn itself toward saving grace, or must grace first liberate the will from its bondage to sin?

This question did not begin with the Reformation. Augustine’s controversy with Pelagius had already forced the church to consider how Adam’s fall affected human ability and how divine grace produces faith and obedience. Medieval theologians continued to distinguish among freedom, necessity, merit, and grace. In the sixteenth century, however, the dispute became newly urgent when Desiderius Erasmus and Martin Luther made the will a defining issue of the Reformation.

More than a philosophical puzzle

The term free will can conceal several different questions. A person may be free from external coercion while remaining governed by his character and desires. He may possess ordinary freedom in civil affairs while lacking the spiritual ability to love God. He may act voluntarily and still fall under God’s providential rule. Much confusion follows when these distinct forms of freedom are treated as though they were the same.

The central Christian dispute therefore concerns neither the existence of human choices nor the reality of moral responsibility. Erasmus and Luther affirmed both. They disagreed over the condition of the will after the Fall, the way grace acts upon it, and whether any power remains by which the sinner may turn toward salvation.

Erasmus enters the controversy

Erasmus of Rotterdam was Europe’s leading Christian humanist. His recovery and publication of the Greek New Testament was instrumental in the spark of the Reformation. Yet he would not join Luther’s break with Rome. After years of pressure to declare himself, Erasmus published De libero arbitrio diatribe sive collatio, usually translated Discussion on Free Will, in September 1524.

The older sense of diatribe meant a reasoned discussion rather than an angry denunciation. The title suited Erasmus’s method. He approached disputed texts cautiously, appealed to the breadth of Christian tradition, and warned against pressing mysterious questions beyond what piety required. He opened by calling free will an “inextricable labyrinth,” a subject that had occupied philosophers and theologians with more trouble than profit.¹

The faculty of the human will … to turn to that which leads to eternal bliss, or to turn away. Desiderius Erasmus

Erasmus did not claim that fallen people save themselves without grace. He described sin as a serious wound and treated divine grace as necessary from beginning to end. Yet he resisted saying that the will had lost every capacity to respond. Commands, warnings, promises, and judgments seemed to him to presuppose a genuine power of alternative response. His proposal was deliberately moderate: attribute nearly everything to grace while retaining a small but meaningful place for the human will.

Luther’s answer

Luther replied in December 1525 with De servo arbitrio, On the Bondage of the Will. His answer was much longer and far sharper. Erasmus’s caution appeared to Luther as skepticism where Scripture demanded confession. For Luther, the dispute touched the certainty of God’s promises, the depth of sin, and the glory of grace. He thanked Erasmus for addressing the decisive issue rather than the outward abuses of popes, indulgences, and purgatory. Erasmus, he said, had reached the hinge upon which the whole controversy turned.²

Free-will is plainly a divine term, and can be applicable to none but the divine Majesty only. Martin Luther

Luther’s statement did not mean that people possess no will or never make real choices. He allowed ordinary human agency in matters “below us,” such as property, work, and civil life. His denial concerned matters “above us”: reconciliation with God and the attainment of salvation. The sinner acts willingly, but the will follows a heart held captive by unbelief. It cannot create faith, merit grace, or free itself. God must give new life, and the liberated sinner then comes to Christ willingly.

The principal differences

Why the debate endured

Erasmus answered Luther in the two-volume Hyperaspistes of 1526 and 1527, but the exchange produced no reconciliation. Their disagreement involved method as much as conclusion: modest probability against confident assertion, ecclesial consensus against Scripture’s self-attesting clarity, and cooperative grace against grace that creates the very response it commands.⁴

Later Lutheran, Reformed, Roman Catholic, and Arminian debates inherited these questions, though their positions should not simply be read back into Erasmus and Luther. The terminology developed, confessions became more precise, and later writers drew distinctions that neither man expressed in the same form. The exchange remains important because it exposes the theological commitments that stand behind the familiar language of choice.

A careful reading should therefore avoid two caricatures. Erasmus did not teach salvation by unaided human effort, and Luther did not teach that people are lifeless machines. The real dispute concerned whether grace merely assists a remaining capacity for God or raises the sinner from spiritual inability, creating a willing response where none could arise from fallen nature.

The controversy over the will is finally a controversy over the nature and necessity of grace.

The companion article Free or Fettered? develops the biblical and theological case for compatibilism, human responsibility, and the renewal of the will. Luther’s complete response to Erasmus is also available here in the unmodified Henry Cole translation.

Read The Bondage of the Will