but you know that it was because of a bodily illness that I preached the gospel to you the first time; (Galatians 4:13)
and that which was a trial to you in my bodily condition you did not despise or loathe, but you received me as an angel of God, as Christ Jesus Himself. (v14)
Where then is that sense of blessing you had? For I bear you witness that, if possible, you would have plucked out your eyes and given them to me. (v15)
So have I become your enemy by telling you the truth? (v16)
According to William MacDonald in Believer’s Bible Commentary, p.1888:
4:13 The gospel was first preached…preached to them in physical infirmity. God often uses weak, despised, poor instruments toaccomplish His work in order that the glory will beHis and not man’s. (emphasis MacDonald’s)
4:14 Paul’s illness was a trial to himself and to those who listenened to him. However, the Galatians did not reject him because of his physical appearance or because of his speech. Instead, they received him as an angel of God, that is, a messenger sent by God, and even as Christ Jesus Himself. Since he represented the Lord, they received him as they would receive the Lord. (Matt 10:40) They accepted Paul’s message as the very word of God. This should be a lesson to all Christians concerning their treatment of the Lord’s messengers. When we receive them cordially, we receiveHim in the same way. (emphasis MacDonald’s)
4:15 When they first heard the gospel they acknowledged what a rich blessing it was to their souls. So great was their appreciation that that they would have given their own eyes to Paul if it were possible. (This might be an indication that Paul’s “thorn in the flesh” was an eye disease.) But where is this sense of gratitude now? Unfortunately, it has vanished like the morning dew. (emphasis MacDonald’s)
4:16 What accounted for their changed attitude toward Paul? He was still preaching the same message, earnestly contending for the truth of the gospel. If this made him their enemy then their position was dangerous indeed. (emphasis MacDonald’s)