Also stated in the last couple of verses, he really wanted them to know all that Christ has done for them. No matter the past things that they have done, God would show grace to them and fully forgive them. That being said they also had to fully give up their life for Christ. "Paul declares his apostolic authority to be independent of any human being" (Galatians. (n.d.)). By giving stories and examples of his own life, I think he was trying to make it as real as possible to convert the Gentiles and get the main point across.
Going back in time and thinking about how the people would respond hearing all of Paul's speech, I think that they would feel ashamed or even have a life changing moment hearing all of this information. Probably at first, they would have felt attacked because Paul was very straightforward, and his tone was stern. Later on, I think that most of them would have really listened to what Paul has said because he was a trusted person in their town. In every group though there is one person that is stubborn and just does their own thing, so I defiantly think that happened even back