The central message of this sermon is that God's mission of salvation has been present and active throughout human history, even before the church or Israel existed. The speaker emphasizes that sin and judgment are indeed part of the story, but they are not the sole focus; rather, God's mission to reach out to humanity with salvation is a thread that runs through every chapter of Scripture. This understanding advances the belief that God's sovereignty and love are not limited by human sin, but rather they work through and in spite of it to bring redemption to all people. The takeaway the teacher wants the listener to understand is that mission is not something new or unique to the church, but rather a continuation of what God has been doing from the very beginning – seeking out humanity with salvation amidst the backdrop of sin and judgment.