Isaiah dates his vision by a king's death: 1"In the year that King Uzziah died." Uzziah had reigned long and well, and success curdled into presumption. He went into the temple to burn incense, a priestly act reserved for Aaron's sons, and was struck with leprosy until the day he died (2 Chronicles 26:16-21). The king who worshiped on his own terms is buried in the same year a prophet sees the true King on his throne.
What Isaiah sees answers Uzziah directly: the Lord 1"high and lifted up," with the train of his robe filling the temple. Above him stand seraphim with six wings apiece: 2"with two he covered his face, and with two he covered his feet, and with two he flew." Reverence, humility, and service, in that order. Even sinless beings keep their distance from unveiled holiness, and the vision opens with creatures who know exactly how near to stand.
Their cry is the center of the vision: 3"Holy, holy, holy is the LORD of hosts; the whole earth is full of his glory!" Hebrew marks the superlative by repetition, holiness at its outer limit. John later says Isaiah "saw his glory and spoke of him" (John 12:41), naming the figure on the throne as Christ.
Isaiah's response is immediate: 5"Woe is me! For I am lost; for I am a man of unclean lips." The confession lands on one organ, the mouth, the very thing his commission will need. He will spend the rest of his life speaking for the LORD, and the first thing he discovers is that his own mouth disqualifies him. He says what is true, that he is lost and that his people are no better.
The answer is precise. A seraph takes a burning coal from the altar and touches it to his lips: 7"your guilt is taken away, and your sin atoned for." Grace lands where the confession was exact. Isaiah receives a personal Day of Atonement, applied to the mouth that stood accused.
Only then comes the invitation. 8"Whom shall I send, and who will go for us?" The question follows the confession and the touch. Isaiah's answer, 8"Here I am! Send me," uses the word Abraham said on Mount Moriah and Samuel said in the temple, Scripture's standing word for a servant made available. He offers it only after being undone.
Uzziah walked into God's presence assuming his own fitness. Isaiah was undone on arrival. Being impressed by God and being fit to serve him are different things, and the text keeps the order fixed: woe, coal, sending. Ask for the particular word, habit, or relationship that a general sense of sinfulness has kept you from naming. Grace is precise, and it reaches where confession reaches.
Hebrews says Christ's blood purifies "our conscience from dead works to serve the living God" (Hebrews 9:14). The altar this coal came from was lit once, for good, and the atonement it pictured has reached us in him.
Prayer
Father, holy, holy, holy are you, and the whole earth is full of your glory. Undo us as you undid Isaiah, and send the coal that touches exactly what we confess. Show us the word, habit, or relationship that still needs your touch. Thank you that the atonement has reached us in Christ. When you ask whom you shall send, let us answer as those first made clean. In Jesus' name, amen.