Luther's understanding of perseverance clearly bears marks of the Roman Catholic tradition and yet differs from it on the key point of the believer's present certitude of the experience of grace. In the context of a late medieval Church whose theology and practices mitigated against such certitude, Luther is horrified that the pope "should have entirely prohibited the certainty and assurance of divine grace." [17] The preacher's essential task is to make the hearers sure of their salvation. "If you want to preach to a person in a comforting way," urged Luther in a midweek sermon on Matt 18:21-22, "then do it so that he who hears you is certain that he is in God's favor, or be silent altogether." [18] Preachers who make their hearers doubt are "good for nothing." Assurance that one is presently in a state of grace is foundational to the Christian life. "I must be able to say," stated the great reformer, "I know that I have a gracious God and that my works, performed in this faith and according to this Word, are good fruits and are pleasing to Him." [19]
A sermon that assures the believer of how he stands with God is true and presents the pure word of Christ. A sermon that fails to do this is "a lie and the devil's doctrine," and such preachers may as well be the "devil's confessor" and a "preacher in the abyss of hell." [20] Luther was hardly one to mince his words on this point.
Like Augustine, Luther believed that regeneration occurred through the waters of baptism. "But," noted the Reformer, "all of us do not remain with our baptism. Many fall away from Christ and become false Christians." [21] In his commentary on 2 Pet 2:22 he writes as follows on apostates in the Church: "Through baptism these people threw out unbelief, had their unclean way of life washed away, and entered into a pure life of faith and love. Now they fall away into unbelief and their own works, and they soil themselves again in filth." [22]
One who has experienced the justifying grace of God through faith can lose that justification through unbelief or false confidence in works. "Indeed,
even the righteous man," writes Luther in his comments on Gal 5:4, "if he presumes to be justified by those works, loses the righteousness he has and falls from the grace by which he had been justified, since he has been removed from a good land to one that is barren." [23]
Martin Luther shared with the Roman Catholic Church of his day the belief that the grace of baptismal regeneration and justification could be lost. On these points he was in agreement with Augustine and Aquinas. Where he differed was on the matter of assurance, being more confident than the Catholic tradition of his time that the believer could enjoy great certitude of his present state of grace. Whether the believer, now in a state of grace, would remain in grace to the end was for Luther an open question. On the one hand, so far as God is concerned Luther believed that the heavenly Father desired the believer's eternal salvation in Christ. Nevertheless from the believer's side it is possible to turn aside from the grace of God and be lost, even after the pilgrimage has begun. Consequently the believer must always take heed lest he fall. [24]
This same tension on the matter of final perseverance -- "secure in Christ, insecure in one's self' -- is also reflected in the Lutheran confessions of the sixteenth century. On the one hand,
article 12 of the Augsburg Confession of 1530 condemns the anabaptist teaching that once justified, the believer cannot lose the Spirit of God. [25]
In the Lutheran view, final apostasy is a genuine possibility for the baptized and justified believer. One the other hand, while the contents of God's eternal decree of election are known infallibly only to God, the believer, by focusing on Jesus Christ as preached in the gospel and presented by the promises of Scripture, can find "sweet consolation" in "this most wholesome doctrine" of predestination, according to the Formula of Concord of 1584. Through present and lively faith in the Christ of the gospel "we are rendered certain that by mere grace, without any merit of our own, we are chosen in Christ to eternal life, and that no one can pluck us out of his hands." [26] There is paradox, then, in the Lutheran understanding of final perseverance. While the matter is theoretically uncertain, for a believer it can become existentially certain, to the extent that the believer maintains unwavering faith in the promises of the gospel and so grows in confidence that he has in fact been included in God's gracious election to salvation.
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