Today I read his comments on Colossians 3:8. Here Paul is trying to show the Colossians what, practically, it means to take "off the old self with its practices and... put on the new self" (3:9-10), and so he exhorts the church: "Now you must rid yourselves of all such things as these: anger, rage, malice, slander, and filthy language from your lips." I think Wright's remarks on this verse, while simple, are powerful:
slander, speech which puts malice into practical effect... and filthy language, words which, either by their foul association or their abusive intent, contaminate both speaker and hearers. All such things are to be put away from your lips: one cannot always prevent angry or hateful thoughts from springing into one's head, but they should be dealt with firmly before they turn into words. It is not 'healthy', as is sometimes supposed, to allow such thoughts to find expression. It is certainly healthy to recognize and face up to one's own anger or frustration, and to search for proper and creative ways of dealing with it. But words do not merely convey information or let off steam. They change situations and relationships, often irrevocably. They can wound as well as heal. Like wild plants blown by the wind, hateful words can scatter their seeds far and wide, giving birth to more anger wherever they land.