The first three chapters of Ephesians remind us of our position in Christ and the many promises and privileges that are ours in Him, while the last three call us to live responsible lives worthy of our calling, to walk as children of the light, and to function in spirit and truth as beloved children of God and fully fledged member of the Body of Christ.
Paul calls us to spirituality, unity, and maturity, while warning against worldliness, instability, and gullibility. He appeals for us to renounce fleshly lusts, worldly ways, unclean thoughts, and greedy attitudes, while clothing ourselves in a new and godly morality where we put off the old sinful man and put on a new Christlike nature by being renewed each day in the spirit of our mind.
Because we are part of a new creation in Christ with a new nature, we are to walk in holiness. Old things have passed away and the inner cleansing of the heart is to be reflected in the outward practice of our daily lives. Spiritual renewal is to be exercised in practical ways; by putting off the old and putting on the new, and the incredible position, promises, and privileges we have in Christ, should be sufficient motivation to live godly lives.