The central message of this sermon is that God's blessing and favor are not solely bestowed upon Mary as an individual, but rather she serves as a vessel for God's grace to be poured out in the Incarnation of Jesus Christ. The passage highlights Mary's humble and innocent nature, and how she receives the news of her pregnancy with a sense of awe and wonder. In calling Mary "blessed," the sermon emphasizes that this blessing is not just about Mary herself, but rather it is about the role she plays in God's plan to bring salvation to humanity through Jesus Christ. The sermon advances the belief that the Incarnation is a fundamental aspect of Christian theology, where God takes on human nature in Jesus Christ, and that Mary's role is crucial in this process. The takeaway for listeners is to understand and appreciate the significance of Mary's blessing as a vessel of God's grace, rather than trying to attribute her blessings solely to herself or to Catholic tradition.