I Corinthians 6:2,3
Do you not know that the saints will judge the world? And if the world is to be judged by you, are you incompetent to try trivial cases? Do you not know that we are to judge angels - to say nothing of ordinary matters?

Whatever happened to "judge not, lest ye be judged"? There is a difference between passing judgment on a person and passing judgment on that same person's behavior. God will judge each person, but we are still obligated to assist each other by monitering our behavior and correcting as needed. When do we look the other way in the face of obvious wrong doing because of fear of passing judgment?