We see a common theme when it comes to the Paul’s epistles is that when he is writing his letters he gives doctrine and practical application. In chapters 1-3 of Ephesians we get the doctrinal part and in chapters 4-6 we get the practical application. Doctrinal means teaching or theology. This is theological teachings of the church. The technical terms are called orthodoxy (right understanding) and orthopraxy (right behavior or conduct). My conduct or my practice is informed by my belief. I am going to do what I know. My theology informs my conduct or behavior.