Why should Christians avoid complacency in their worship?

Christians are warned against complacency because it can dull their sensitivity to God's presence and diminish their spiritual vitality. In the sermon, Haggai's address to the people of Judah serves as a call to reflect on their spiritual state. They became comfortable and missed the priority of worship, thinking physical safety equated to God's favor. Revelation 3:15-16 warns against being lukewarm, saying that such indifference could lead to being spewed out of God's mouth. True worship requires continual engagement and a heart that recognizes the necessity for God’s grace and presence.