In a church service led by Trevor Hartley, the message emphasizes the importance of being filled with the Holy Spirit, particularly in relation to speaking in tongues. Hartley discusses the mandate, obstacles, and mission associated with this spiritual experience, highlighting the transformative power of Jesus' name and the communal responsibility of Christians to spread good news and restoration. He encourages the congregation to let the Holy Spirit guide their prayers and actions as they impact their community and beyond, and to seek this empowerment actively.