The central message of this sermon is that God has not rejected his people Israel, despite their national rejection of Jesus as Messiah. The passage argues that God's election of Israel remains in force, and He will not reject them because they are His chosen people. This idea is rooted in the Bible's concept of God's sovereign choice and election, which cannot be reversed or undone. The sermon highlights the existence of a faithful remnant within Israel, chosen by God's grace, who remain true to Him despite the majority's disobedience. This remnant is seen as evidence that God's plan for salvation through Jesus is not limited to individual believers but also includes His covenant with Israel as a nation. The takeaway from this sermon is that God's sovereignty and election are unwavering, and He will ultimately bring about the salvation of all Israel, as prophesied in Romans 11:26.