God opposes the proud and gives grace to the humble. But somehow, we think that we are authorized (by God, no less!) to criticize and condemn those for whom Christ died. When we use bad language against brothers and sisters, this text shows us that God is working against us.
Let that sink in.
Christ willingly died for the person who you are complaining about…that does not dress right…who does not worship the same way we do…and on, and on, and on. We need to repent of our critical spirit, especially towards brothers and sisters in the church family. (Especially your local church family!) Listen to this clarion call to never speak against brothers and sisters, and realize it is only the Spirit of Christ (the Holy Spirit) that can do this through us.