Paul returns to the question of verse 2. The Galatians had received not only those gifts of the Spirit given to all believers in all ages, but had also seen miracles done among them through Paul and Barnabas during the time of the first missionary journey.
Who is the ‘he’ at the start of the verse? Some say Paul means himself, but most understand him to mean the Lord. Although it was through him that God worked among the Galatians, and through him that the gospel was preached, yet it was God who was the ultimate giver of these gifts and it would be an unusual way of speaking to say that Paul ministered the Spirit to them. There is an expression close to this in 2 Corinthians 3:6-8, but the result of this interpretation would be to change the subject from the faith or works of the Galatians, to the faith or works of the one who ministered to them – namely Paul. This would take the focus away from where Paul wants it to be placed.
Some prefer the translation ‘powers’ instead of ‘miracles’ and suggest that these were done ‘in them’ rather than ‘among them’, allowing a reference not to outward miracles but to inward moral and spiritual changes. However Luke makes clear that Paul certainly did do miracles in Galatia, and Paul would not use a lesser argument when there was a greater one available to him.