How do we know that it's wrong to be judgmental?

In James 4:11, the act of judging others harshly is equated with condemning them, which is inappropriate for us as believers. Romans 14:4 reinforces this by reminding us that we are not to judge another man's servant but leave such matters to God. Furthermore, the hypocrisy of bringing judgment on others is challenged by Matthew 7:2, where it states that the measure with which we judge will be used against us. Recognizing our own failings fosters an attitude of humility and love, which should define the relationships within the family of God.