What did Paul avoid doing so that the ministry would not be blamed?

Les explains that Paul was constantly undermined by Judaizers from Israel, by the pagan world, and even by believing Jews from the element of the twelve in Jerusalem, who claimed he was an imposter and a false teacher because he lacked credentials. If he could have had letters of commendation from Peter, he would not have had so many problems, but he did not. All he had for proof of his ministry were the pagans who had been saved and set on the rock Christ Jesus, and their lives proved it. In 2 Corinthians, Paul is determined not to do anything that could blame the ministry, but in all things approving himself as a minister—not of Jerusalem, not of Judaism, not of Peter and the eleven.