I was doing a little research on a Greek part of speech for an upcoming class. I was consulting my old Greek text (Greek To Me by J. Lyle Story & Cullen I. K. Story) and I came across this quote that reminded me of my purpose in preaching.
The imperative mood aids our understanding of the letter to the Ephesians. In the first three chapters, the imperative appears only once (2:11), because at the outset, the writer desires to highlight the grace of God that unites Jew and Gentile in one body in Christ. The indicative mood pre-eminently, can do just that. In contrast, chapters 4-6 contain some 38 imperatives, which point us to the disciplined life that flows forth from the grace of God portrayed in chapters 1-3.
I have taught for a number of years that most of Paul's letters have a pattern to them. Paul first reminds his readers of the grace of God in Christ. Then he tells them have to live in view of that grace. Paul's use of the imperative mood in Ephesians really brings home this pattern. This pattern also becomes my two purposes in preaching.
My first purpose in preaching is to proclaim God's mighty act of salvation and deliverance in Jesus Christ. It is an accomplished task that didn't need or use any of we humans to accomplish (yes he used us in carrying out the plan - like Judas - but not in the sense which I mean in this sentence). It was done solely by God. It is given to us freely. We didn't earn it.
The other purpose in my preaching is to make known that God's grace binds us to the "disciplined life." This life can only be lived out in the context of the cross. We preachers need to make sure that we pay as much attention to preaching about the grace of God through Jesus Christ as we do how to live the Christian life. Our folks need to know that while they live the Christian life God is graciously smiling down upon them because they are living that life while trusting in him.