Pastor McKinney discusses the concept of a "salty church," where Christians embody the flavor and love of Christ in their lives, making it harder for people to ignore Jesus. He emphasizes the importance of serving others, drawing from Jesus’ example of humility and sacrifice, highlighting that true greatness in the kingdom of God comes from serving, not dominating. By referencing the requests of disciples James and John, he illustrates how selfish desires can distort our understanding of honor and greatness, reminding us that true discipleship involves laying down our interests for Christ and others. Ultimately, he calls us to evaluate our own lives and attitudes towards service, using the Lord's supper to reflect on Jesus' sacrifice and our commitment to serving one another.