"Holiness means 'set apart or to separate.' To say that God is holy means first of all that he is God and not man. He is utterly separate from all that is human. God is not like us at all, not in any way. He's different. Holiness is the moral character of God. He is pure; he is complete; he is whole. Holiness is the only attribute of God that is presented in Scripture with a threefold repetition. The angels did not sing, 'Love, love, love' or 'Just, just, just.' They sang, 'Holy, holy, holy.' Every time you hear the word holy, think separation. God is completely set apart and entirely different than you and me.
"Understanding God's holiness is like entering a planetarium from a busy, noisy street. The dimmed lights and the hushed sounds create a sense of reverence. As we look up, the universe opens up over our heads. Earth becomes one of the smallest planets, and we become one of its smallest creatures. In that awesome moment, we realize God is so much greater than we are.
"Unfortunately, we have lost this view of God: the high, exalted, lofty, exclusive, unparalleled, unprecedented character of God. Preferring the comfort of his nearness, we have lost the reality of God's holiness. We have departed from the biblical picture of God's holy and exalted nature. Instead, we have humanized God by calling him The Man Upstairs or Big Daddy. God is not whatever my conscience or imagination would like him to be. And we dare not say, 'When I get to heaven, I'm going to tell God a thing or two.' God is indescribable.
"Holiness rightly understood demands caution. When it comes to God and the things of God, we are to be very careful. Let's suppose you were asked to carry a box full of TNT or were handed a case containing a bomb that could be set off with the slightest movement, wouldn't you handle it carefully, cautiously? In the same manner are we to treat God."