He opened with a recognition of the necessity of the work of the Spirit in the proclamation of the Word. A helpful turn of phrase was: “I cannot make happen the one thing that I want to make happen.”
So the extended title is: "The preaching of Christ in the power of the Holy Spirit"
The nature of the working of Preaching
Does the work that only God can do happen by works of law? Or only by hearing the word with faith? (Gal 3:1-3) Miracles in the lives of people come from people hearing the Word with the Spirit that awakens faith in those who hear it.
These together enable our people to crucify sin and magnify Christ.
How the Spirit and word work together
John 14:16:
The Holy Spirit is not interested in empowering anything but Christ. So if you preach and magnify Christ, then he is right there with you. Like a wingman, a jet in formation. Because his purpose is to magnify the Son.
When you preach Christ, he's there to put boosters behind it all the time.
How we fight temptation 'by the Spirit'
Romans 8:13
We want our people to kill sin. So how do they do it? What does 'by the Spirit put sin to death' mean?
John understands that to mean wielding the sword of the Spirit, the Word of God. When faced with temptation, remind yourself of a truth of the glory of Christ by which that temptation is killed. And so we need to be teaching them the word well so that they have a sword with which to kill sin when temptation arises.