If you're not in the habit of taking notes during a sermon, you might consider doing so for the sake of post-sermon conversation. (I'm sure there are some among us, however, who can file away scrolls of mental notes. If you are that person, please share with me your strategy!) In any case, we want to listen well to the sermon so we can be helpful in assisting others make the most of the message. Each Sunday, try approaching someone older in the faith and someone younger to interact with the message's content. Dig deep theologically, but never forget to tunnel into the realm of application. We need each other to help each other strategize how to live godly lives. This type of discussion should include how believers should apply certain truths corporately (in community). It should also entail what specific action points look like for a believer in a specific life context. And don't forget accountability! We need others to prayerfully keep us on track in terms of following through with established application points.
3. Entertain the message for further encouragement and equipping.
I know of several individuals who make time at some point in their week to re-listen to the previous Sunday's sermon. This is a fantastic routine to begin. Such a practice keeps the content fresh in our minds and hearts, as well as keeps us focused on Scripture. In fact, it might even be helpful to listen to the sermon while you're examining the Scriptures that informed the message. (Are these things so?) In addition, think of the opportunity we have to revisit the realm of application. Maybe there is something you missed the first pass through the message that would equip you to love the Lord with greater affection and serve Him and others with greater accuracy. Continually look for ways to mature in knowledge and practice.
4. Eagerly anticipate the next message.
We are blessed at Providence to systematically go through books of the Bible on Sunday mornings. Doing so allows us to see how biblical authors, under inspiration of the Holy Spirit, crafted their texts. This leads to greater awareness of how verses connect to other verses, chapters other verses, and books to the full canon of Scripture. Though sermons serve us well as stand-alone units, we would do well to not only view sermons as stand-alone units. Intake a sermon's content well so that you are positioned to receive the next message with greater understanding of the flow of rationale. Anticipate making connections. Anticipate having questions from the previous week answered. Anticipate dwelling on the magnificence of the Holy Spirit's crafting of the Word.
There are likely many more ways to maximize a sermon's efficacy after hearing it, but I hope the brief points above serve you well. If anything, they should assist in starting a helpful discussion. As we gather on Sunday mornings to learn of our gracious Lord, let us be those who receive the Word well and live dependently resolved to do what is necessary to live lives worthy of our calling.