As a Lutheran I’m less interested in Luther’s Bondage of the Will and more interested in the Lutheran Confessions on the subject.
My understanding is that Luther’s Bondage of the Will is a scathing criticism of Erasmus’ half-hearted defense of free will rooted in Erasmus’ philosophical background. Erasmus was a philosopher, not a theologian. Luther’s criticisms are borne out of Erasmus’ failure to take the subject seriously.
An accurate understanding of the Lutheran doctrine on human inability would be found in the Solid Declaration and its Epitome,
From the Epitome of the Solid Declaration of Concord
1. Concerning this subject, our doctrine, faith, and confession is, that in spiritual things the understanding and reason of man are [altogether] blind, and by their own powers understand nothing, as it is written 1 Cor. 2:14: The natural man receiveth not the things of the Spirit of God, for they are foolishness to him; neither can he know them when he is examined concerning spiritual things.
2. Likewise we believe, teach, and confess that the unregenerate will of man is not only turned away from God, but also has become an enemy of God, so that it only has an inclination and desire for that which is evil and contrary to God, as it is written Gen. 8:21: The imagination of man’s heart is evil from his youth. Also Rom. 8:7: The carnal mind is enmity against God; for it is not subject to the Law of God, neither, indeed, can be. Yea, as little as a dead body can quicken itself to bodily, earthly life, so little can man, who by sin is spiritually dead, raise himself to spiritual life, as it is written Eph. 2:5: Even when we were dead in sins, He hath quickened us together with Christ; 2 Cor. 3:5: Not that we are sufficient of ourselves to think anything good as of ourselves, but that we are sufficient is of God.
3. God the Holy Ghost, however, does not effect conversion without means, but uses for this purpose the preaching and hearing of God’s Word, as it is written Rom. 1:16: The Gospel is the power of God
unto salvation to every one that believeth. Also Rom. 10:17: Faith cometh by hearing of the Word of God. And it is God’s will that His Word should be heard, and that man’s ears should not be closed. Ps. 95:8. With this Word the Holy Ghost is present, and opens hearts, so that they, as Lydia in Acts 16:14, are attentive to it, and are thus converted alone through the grace and power of the Holy Ghost, whose
work alone the conversion of man is. For without His grace, and if He do not grant the increase, our willing and running, our planting, sowing, and watering, all are nothing, as Christ says John 15:5: Without Me ye can do nothing. With these brief words He denies to the free will its powers, and ascribes everything to God’s grace, in order that no one may boast before God. 1 Cor. 1:29; 2 Cor. 12:5; Jer. 9:23.
As I’ve never read the Bondage of the Will, nor is it an authoritative text within the Lutheran Confessional tradition, I am unable nor particularly motivated to defend it or Luther’s rhetoric within it.
Luther’s rhetoric, historically, was known to be quite sharp to the point of hostile–though this was not altogether unusual for the time. Men like Philip Melancthon tried to soften Luther’s rhetoric, though this sometimes led to controversy as Philip was soft to the point of compromise. Which is why the best source for the Evangelical tradition is the Book of Concord.
I find the idea of God enslaving the human will to be a strange idea. As best as I’m aware Dr. Luther never taught this; the will is in bondage due to sin. God is not the enslaver of the will, but the liberator of the will.
It is only the regenerate man who can, by the power of the Holy Spirit, cooperate with God in sanctification through the new obedience which is born of grace by the Spirit on account of the Gospel–that is to say, by faith.
At any rate, I reject Decision Theology because I do not believe it to be biblically defensible; and because it places the locus of saving power not at the Cross and in God’s mercy alone, but attributes to man the powers of his own salvation in order that man may boast of himself, rather than in God’s grace alone, and the Cross alone.
I didn’t choose God. God, in His love, chose me in Christ.