A biblical theme from the Book of Isaiah in the Old Testament. "And it came to pass in the year that king Uzziah died, that I saw the Lord: and he sat upon a throne, high and lifted up, and the hem of his garment filled the temple. "Woe is me, I am lost. I am a man of unclean lips, and I dwell among the people of unclean lips, and I have seen with my own eyes the King, the lord of hosts." And he took with the tongs from the altar, and touched my mouth, and said, Behold, this is come upon thy lips, and thy guilt is taken away, and thy sin is atonement."