I can’t remember the last time I attended a church service or heard a Sunday message that dealt with the subject of holiness.
I have heard many messages warning Christians to stay away from sin. In these sermons, holiness is typically explained in terms of “being separate,” which usually translates into avoiding the dangers of The Big Three – sex, alcohol and money (more specifically, the sin of not giving 10% of my money to the local church).
I will summarize this popular understanding of holiness by quoting an old (inappropriate?) saying, “I don’t drink and I don’t chew, and I don’t go with girls who do.”
But such an approach to holiness grabs the wrong end of the stick, and a very flimsy stick at that. It’s like grabbing a lizard by the tip of its tail and saying, “I’ve got it!” as you watch the greater part of the lizard scurry away to hide.
So, I thought I would write a series of 3 posts explaining (what I understand to be) the Biblical concept of holiness. There are 3 aspects to holiness in the Bible. Each post will deal with 1 of these 3 inter-related elements, explaining how they build on each other.
To begin with, holiness is not about us. Holiness is about God, who God is and what God does.
The Bible insists that God is utterly unique. There are no other gods around for comparison. No one can suggest, for instance, that Yahweh is an especially tall god, as far as gods go. Because there are no other gods. How tall would a tall god be in comparison to an especially short god? Such talk is nonsense, for there is only One God, and He is what He is. That’s it.
The prophet Isaiah asked rhetorically, “To whom will you compare God?” (40:18). The answer is: to nothing and to no one. Yahweh is it.
God is the sole, absolute standard for Himself. God defines Himself as He is. (Yes, I know. I am committing the modern faux pas of using masculine pronouns for God. But that is how both the Old Testament and Jesus refer to our Father in heaven.)
God exists in a category of One.
Whatever we might compare God to is, by definition, not-God. We are left to fumble with the inadequacies of language, for no description of God will ever prove sufficient. We are limited to using analogies, metaphors and similes for our descriptions (e.g. “God is like such-and-such”, “God’s eyes see us”, etc.), and even these efforts only work, in a limited sense, because human beings are created as God’s image. (Now we are dealing with the 
theological pros and cons of the “analogy of being,” the analogia entis, which we may explore some other time.)
Some theologians have referred to God’s essential uniqueness as His “Wholly Otherness.” Since Yahweh is the only divine Person inhabiting the category of “God,” Yahweh is Wholly Other.
THIS is where a proper understanding of God’s holiness must begin. God is holy as the One who is Wholly Other.
Let me explain by way of borrowing the plot-line from Edwin Abbott’s famous story, Flatland: A Romance of Many Dimensions. Imagine living in a two-dimensional world. That is, your universe has length and width, but
no depth, no height.
Your world is like a flat piece of paper. All of its inhabitants are also two-dimensional. So, you walk to work each day as a stick-figure. As you pass by, you wave to your neighbors, Mr. & Mrs. Circle, as well as the Straight-Line family and Madame Triangle.
One day, you all hear a friendly disembodied voice calling, “Hello! How are you all?”
But none of you can see anything. Where is that voice coming from?
“Hello,” it calls out again. “My name is Mr. Ball!”
“Mr. Ball?,” you all wonder. “We have never heard of such a thing. What in the world is a ball?”
The voice answers, “Well, a ball is also a sphere.”
“What’s a sphere?” asks Madame Triangle. “Is it like a circle?”
“Well, yes and no, but not really,” replies Mr. Ball. “Why don’t I come visit you in Flatland and show you who I am,” he suggests.
Mr. Ball then proceeds to enter into Flatland. But still no one sees a sphere.
At first, everyone notices a small dot that appears out of nowhere. Then the dot morphs into a tiny circle. The circle expands, becoming larger and larger. Then it abruptly stops growing and reverses itself, becoming smaller and smaller. Finally, the circle becomes a dot again, and then vanishes all together.
“There you go,” cries Mr. Ball. “I showed myself to you! You have just seen me. Now do you understand what a sphere is?”
Obviously, the answer is No. Two dimensional creatures may perceive something of the three-dimensional creature’s “personal revelation” – in this case, an ever expanding and shrinking circle – but fully grasping or comprehending Mr. Ball’s self-disclosure is impossible for folks living in Flatland. The difference between a two-dimensional and a three-dimensional existence are too great.
Mr. Ball is wholly other than Mr. & Mrs. Circle.
So ends my feeble attempt at describing the essential nature of divine holiness. And when we combine God’s Wholly Otherness together with the alienation created by human sinfulness, we are left with a yawning chasm separating humanity from God that Sǿren Kierkegaard calls “the infinite qualitative difference.”
An infinite qualitative difference looms large between sinful human beings and our Wholly Other God.
Recall Moses’ experience at Mt. Sinai (Exodus 19). Yahweh is calling Israel into a deeper, more intimate relationship with Himself by way of a new 
relationship described in the Sinai Covenant (see verses 5-6). It is a time of celebration as Yahweh “comes down” to reveal Himself more fully, more intimately and personally to the entire nation.
God is not angry with Israel. He is not arriving to judge or to condemn a wayward people. Not at all. Yahweh is giving Himself over to His chosen people, so that they may all enjoy deeper covenant fellowship together. This is the beautiful “marriage ceremony,” if you will, between God and his chosen people!
Yet, as Yahweh appears atop Mt. Sinai,
“…there was thunder and lightning, with a thick cloud over the mountain, and a very loud trumpet blast. Everyone in the camp trembled…Mt. Sinai was covered with smoke, because Yahweh descended on it in fire. The smoke billowed up from it like smoke from a furnace, the whole mountain trembled violently, and the sound of the trumpet grew louder and louder” (verses 16-19).
Yet, God is still not angry. He is just showing up for the party.
Our heavenly Father is the Holy One, the One and Only God who was and is and is to come, Whose perfect ways are entirely beyond our fallible, frail, fallen human (in)ability to (mis)understand.
What can we do but fall down or tremble in awe and wonder to adore Him in His Holiness?
What else but to join in with the heavenly, six-winged seraphs who cry out,
“Holy, holy, holy is the LORD Almighty; the whole earth is full of his glory!” (Isaiah 6:3)