The central message of the sermon is that the Incarnation, the event where God became human through Jesus Christ, is a mysterious and profound union of deity and humanity. The speaker emphasizes that we cannot fully comprehend or explain this event, but by attending to it, we can grow in our appreciation and understanding of its significance. The incarnation is presented as the fundamental aspect of salvation, where God the Son took upon himself full and complete humanity to accomplish God's plan of salvation. The sermon highlights Mary's response to Gabriel's announcement, where she said "May it be to me as you have said," demonstrating her faith and willingness to submit to God's will despite not fully understanding the implications. This message advances the belief that salvation is a deeply personal and intimate process between God and humanity, and that our understanding of this event should not rely on scientific or detailed explanations, but rather on a deep appreciation for its significance. The takeaway from the sermon is that we must approach the Incarnation with reverence and humility, recognizing the limits of our understanding and the mystery of God's ways, while still seeking to grow in our knowledge and appreciation of this pivotal event in human history.