The Lord reveals here that at the end of the day people know God is real, is King, and is the Judge. Not only do people know that we come from somewhere (Romans 1:18–20), but people know too that evil and injustice will ultimately be punished (Romans 2:1–5).
16 calling to the mountains and rocks, “Fall on us and hide us from the face of him who is seated on the throne, and from the wrath of the Lamb,