Human relationships tend to return like for like. When people love you, you love them; and those who hate you are hated in return. Using the analogy of family clothes or uniform, Paul says that our outward appearance should be like that of God and all His family. He is patient, very patient. He does not get angry quickly. That does not mean that God is never angry, but that He withholds His judgement, waiting for sinners to come to repentance. When they do, He is forgiving, completely forgiving.