What was the miraculous transformation that the Holy Spirit produced in the Galatians?

Les explains that the Holy Spirit is capitalized and worketh miracles among you, and the question is whether this is by the works of the Law or by the hearing of faith. The Galatians could not perform miracles under the working of the Law; it was impossible. But when the Holy Spirit activated the hearts and minds of those pagan Galatians and others throughout the Roman Empire, the result was a miraculous transformation from paganism with all its excesses, idolatry, and immorality. They stepped out into a whole new lifestyle, which Les says is miracle enough in itself. There may have been other manifestations in the early church, though Paul does not explicitly delineate them. The same question remains: if you have witnessed a miracle, was it through keeping the Law or through the manifestation of the Spirit activated by faith? Plus how much? Nothing. Les emphasizes that we are not under Law but under grace, and we come under grace and out from under the Law by faith plus nothing. This is the whole theme of Galatians: don't be suckered into a works religion, but maintain that we are saved by grace through faith, plus nothing.