The doctrine of the holiness of God = If I believe God is holy, then I will live set apart.

Leviticus 19:2 (ESV)
“Speak to all the congregation of the people of Israel and say to them, You shall be holy, for I the Lord your God am holy.”

Matthew 5:48
You therefore must be perfect, as your heavenly Father is perfect.

God’s holiness is the essence of all that He is.

Isaiah 6:1–8
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. 2 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. 3 And one called to another and said: “Holy, holy, holy is the Lord of hosts; the whole earth is full of his glory!” 4 And the foundations of the thresholds shook at the voice of him who called, and the house was filled with smoke. 5 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!” 6 Then one of the seraphim flew to me, having in his hand a burning coal that he had taken with tongs from the altar. 7 And he touched my mouth and said: “Behold, this has touched your lips; your guilt is taken away, and your sin atoned for.” 8 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.”

1) Believers must behold the holiness of God. (v. 1-4)

2) Believers must react to the holiness of God (v. 5)

3) Believers must experience the holiness of God. (v. 6-7)

4) Believers must respond to the holiness of God. (v. 8)