The central message of the sermon is that salvation is a sovereign act of God's mercy and love, where He chooses to save sinners through Jesus Christ alone, not because of any inherent worth or goodness in humans. This idea is rooted in the Bible's teaching on predestination, election, and the exclusivity of salvation through faith in Christ. The sermon emphasizes that humanity is dead in their sins and inherently opposed to God, but that He chooses to save them by His grace alone, unmerited and undeserved. This message advances the belief that human salvation is not dependent on human effort or goodness, but solely on God's sovereign initiative and mercy. The takeaway for listeners is that they should understand themselves as sinful and in need of God's mercy, and that faith in Christ is the only means of salvation, apart from any inherent merit or worth in humans.