I have committed myself to Christological preaching, but one of the pushbacks on Christological preaching, at least as I practice it, is that it is not practical enough. The standard preaching advice for many has been that each sermon should include or conclude with practical applications of the text.
I agree with this in a sense, but "practical" often takes the form of a "to-do" list, a series of actions we must take to "apply" the text. The problem with this is that it seems to me to render the gospel null and void. Our response to the gospel is always that of repentance and faith, not action. We do not "do" something to apply the gospel, the gospel "does" something to us. Thus I have been very cautious in offering "to-do" lists from texts.
On the other hand I am aware that the Bible is full of commands that demand obedience. Yet, while acknowledging that, I am still left with the Colossians 2:20-23 conundrum.
In other words, telling people what to do and not do has little or no value in getting them to do or not do what they should or shouldn't do. This doesn't mean there aren't things we should and shouldn't do, but do's and don'ts won't get it done.
So how do we resolve this conundrum? T. David Gordon in his book Why Johnny Can't Preach offers some "practical" thoughts:
I believe that as people's confidence in Christ goes they do, ordinarily and inevitably, bear fruit that accords with faith. Thus, there is no need for some trade-off here, or some alleged dichotomy suggesting that we need to preach morality if we are to have morality. No; preach Christ and you will have morality. Fill the sails of your hearers' souls with the wind of confidence in the Redeemer, and tey will trust him as their Sanctifier, and long to see his fruit in their lives. Fill their minds and imaginations with a vision of the loveliness and perfection of Christ in his person, and the flock will long to be like him. Impress upon their weak and wavering hearts the utter competence of the mediation of the One who ever lives to make intercession for them, and they will long to serve and comfort others, even as Christ has served and comforted them.