The central message of this sermon is that true devotion to God involves recognizing our limitations and not trying to do His work in our own strength, but rather surrendering to His plan and timing. This is illustrated through King David's desire to build a temple for God, which was actually God's promise to David himself, namely the establishment of an eternal house, throne, and kingdom through his descendants. The sermon highlights that even when we have good intentions and desires to serve God, we must be mindful of God's sovereignty and not try to usurp His authority. Instead, we should respond in faith and obedience to what He has already done for us, as seen in the Davidic covenant and its fulfillment in Jesus Christ. This message emphasizes the importance of humility, trust, and surrender in our relationship with God.