I have been remembering the Reformation by pondering the logic of the first few verses of Galatians 3:
O foolish Galatians! Who has bewitched you? It was before your eyes that Jesus Christ was publicly portrayed as crucified. Let me ask you only this: Did you receive the Spirit by works of the law or by hearing with faith? Are you so foolish? Having begun by the Spirit, are you now being perfected by the flesh?The background to this passage is that the Galatian churches planted by Paul have been visited by other teachers, who have sought to persuade these Gentile believers that they must keep the Law of the Old Testament. Of course we don't have their side of the argument, only Paul's, but my guess is that the Law was being offered as the path to growth in godliness - faith in Jesus is a great start, and gets you in to God's family; but to stay in, to grow, to make it to completeness, to enjoy perfect righteousness, pursue the Law. We can see what Paul's response is by working backwards through these verses.
The central question is this: having begun by the Spirit, are you now being perfected by the flesh? Given that the beginning of your Christian life was all from God, all his doing, are you now going to push on to complete godliness by means of human effort? The Galatian believers would doubtless have wanted to answer in the negative; so would the mediaeval Catholic Church. No, in keeping the Law the Galatians saw themselves as continuing in dependence on God's grace. So, to, did the Church of Luther's day. In fact, what would continued dependence on God look like, if not regular penance, indulgences, the sacramental economy? No, Paul, we're not seeking to be perfected by the flesh.
But Paul wants to know: how did you receive the Spirit? Was it by works of the Law, or by hearing with faith? This sharpens the question. What does it look like to depend on grace? What did it look like, Galatians, when you first became Christians? Did it look like the Law? No, it did not. It was faith in what you heard that first brought the Spirit to you. God's grace came to you as you believed. Now, do you suppose that God works inconsistently with himself? Did he first bring you in through faith, so that he could keep you in through the works of the Law - or indeed, the works of the Church's penitential system? Paul's point here is that God is certainly not inconsistent: as your Christian life began through hearing with faith, so it must continue.
So we might ask: well, what is it that we must hear with faith? Paul is not here extolling the virtue of faith in general, and neither was Luther, despite what some secular observers of the Reformation might think. It is faith in something particular. It was before your eyes, says Paul to the Galatians, that Jesus Christ was publicly portrayed as crucified. It was in Christ crucified that the Galatians had trusted; this was the message which they had heard with faith. The content of that message matters. By trusting in Christ crucified, the Galatian Christians identified with him in his death, and confessed that it was their death too: the death of their old selves, the judgement on sin which they deserved now executed in the Messiah. And as they heard this message with faith, so the Spirit was given, and they lived - the new life of Christ living in them. (For all which, see Galatians 2:20).
How did you get in? By hearing the message of Christ crucified and believing it. How will you stay in? By hearing the message of Christ crucified and believing it. How will you grow? By hearing the message of Christ crucified and believing it. What will keep you to the end? Hearing the message of Christ crucified and believing it.
This is what the Reformation was all about. Not really faith in and of itself, but the Word - the Message, the Good News: that God in Christ was reconciling sinners to himself, that in Christ the old has gone and the new has come, that my sinful self was nailed to his cross so that I can live in new life. Lots of people have lots to say about the Reformation on this anniversary, good and bad. Much can indeed be said. At its heart, this movement was about the message of Christ crucified, and that is worth celebrating.