He was attacked. Some in the Corinthian church rejected Paul personally. He reminds the church not to judge by worldly standards. As Christians today, we need to avoid using wordly standards to judge.
We all like a story that ends well. For Paul, there were still problems at Corinth. He warns the handful in that church who were still causing problems, but then encourages the church as a whole to be like minded. As a newly started congregation, our church family can gain from Paul's final exhortation to be like minded. Imagine what God can do with us when we put our minds together and serve as one.