Holiness is the most distinctive character of God. We are not ready to serve Him until we come to see His holiness which reveals to us our sin and misery; and embrace His mercy which offers us forgiveness and cleansing in Christ. Once we have a clear vision of His glory and receive cleansing from our sins through Christ and His atoning blood, we are inspired/moved to tell the world about Him that the whole world might come and bow before Him who is the King of kings and the LORD of lords!
In the year that King Uzziah died I saw the Lord sitting upon a throne, high and lifted up; and the train of his robe filled the temple. Above him stood the seraphim. Each had six wings: with two he covered his face, and with two he covered his feet, and with two he flew. And one called to another and said:
“Holy, holy, holy is the LORD of hosts;
the whole earth is full of his glory!”
And the foundations of the thresholds shook at the voice of him who called, and the house was filled with smoke. And I said: “Woe is me! For I am lost; for I am a man of unclean lips, and I dwell in the midst of a people of unclean lips; for my eyes have seen the King, the LORD of hosts!”
Then one of the seraphim flew to me, having in his hand a burning coal that he had taken with tongs from the altar. And he touched my mouth and said: “Behold, this has touched your lips; your guilt is taken away, and your sin atoned for.”
And I heard the voice of the Lord saying, “Whom shall I send, and who will go for us?” Then I said, “Here I am! Send me.”