Although Paul is writing because his wider ministry is limited by imprisonment, he is not writing aimlessly. He writes with purpose. He has heard good reports about the faith of the believers in Colossae and he is broadly encouraged, but he also has some concerns about teaching they might be receiving and the impact it is having on the outworking of their faith. Hence, Paul speaks first to theology and then to practice. There does not seem to be the level of concern Paul has in other situations.