In our study of Isaiah chapter six, we look at God's calling and plan for Isaiah. We will look at how God can take a humble yet willing servant and use him in a mighty way. We see that God has the power and authority to use whomever He chooses and that He prepares those that He calls.
"In the year that King Uzziah died, I saw the Lord seated on a throne, high and exalted, and the train of his robe filled the temple. Above him were seraphs, each with six wings: With two wings they covered their faces, with two they covered their feet, and with two they were flying. And they were calling to one another: 'Holy, holy, holy is the Lord Almighty; the whole earth is full of his glory.'" NIV translation
God calls to Isaiah in a vision that includes God sitting on his throne in heaven. The train of his robe fills the temple so that there is no room for anything else to be worshiped. Isaiah sees seraphs which are unearthly beings that serve God in heaven. These are very similar if not the same creatures that are described by John in Revelation 4.
As in the book of Revelation, the seraphs are proclaiming the holiness of God. Through this vision, God was allowing Isaiah to see that God is set apart (holy) and in charge. A part of that holiness is the fact that He can use whoever He chooses to accomplish His purposes.
"At the sound of their voices the doorposts and thresholds shook and the temple was filled with smoke." NIV translation
What a vision of power as the temple is shaking and filled with smoke simply by the voices of God's servants. Meanwhile, God is calmly sitting on his throne. When our situations seem difficult and it seems like chaos and trouble are all around, we can take comfort in this vision and realize that God is in control.
"'Woe to me!' I cried. 'I am ruined! For I am a man of unclean lips, and I live among a people of unclean lips, and my eyes have seen the King, the Lord Almighty.'" NIV translation
The result of seeing God on his throne is that Isaiah is humbled.
He saw his sinfulness and knew that it did not belong in the presence of God. This is the starting point for anyone that wants to serve the Lord, in that, we must realize that we are not worthy on our own.
"Then one of the seraphs flew to me with a live coal in his hand, which he had taken with tongs from the altar. With it he touched my mouth and said, 'See, this has touched your lips; your guilt is taken away and your sin atoned for.'" NIV translation
As fire is the way of purification, the coal was used to purify the mouth of Isaiah. After purification, he is ready to be used by God.