In this sermon, Derek discusses the significance of the real estate deal between David and Ornan in 1 Chronicles 21, illustrating that God had a predetermined place, purpose, and price in mind for this land. He emphasizes that the location, Mount Moriah, was chosen by God and would play a crucial role in biblical history, including the site of Solomon's temple and Jesus's crucifixion. Derek highlights that David understood the necessity of paying the full price for the land, signifying the importance of sacrifice in fulfilling God's plans. Ultimately, he calls the church to recognize that God has a purpose for their community and encourages them to invest wholeheartedly in their calling.