In the year that king Uzziah died I saw also the Lord sitting upon a throne, high and lifted up, and his train filled the temple.

Above it stood the seraphims: each one had six wings; with twain he covered his face, and with twain he covered his feet, and with twain he did fly.

And one cried unto another, and said, Holy, holy, holy, is the LORD of hosts: the whole earth is full of his glory.

And the posts of the door moved at the voice of him that cried, and the house was filled with smoke.

Then said I, Woe is me! for I am undone; because I am a man of unclean lips, and I dwell in the midst of a people of unclean lips: for mine eyes have seen the King, the LORD of hosts.

Then flew one of the seraphims unto me, having a live coal in his hand, which he had taken with the tongs from off the altar:

And he laid it upon my mouth, and said, Lo, this hath touched thy lips; and thine iniquity is taken away, and thy sin purged.

Also I heard the voice of the Lord, saying, Whom shall I send, and who will go for us? Then said I, Here am I; send me.  Isaiah 6:1-8

Note: When Isaiah saw God for Who He is, Isaiah saw himself as he was.  When Isaiah was cleansed, then and only then was he ready to serve God.