Holiness of God

Do we understand and/or appreciate the holiness of God? Here is Isaiah’s account of his personal encounter with God and his reaction:

[6:1] 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.”
(Isaiah 6:1-7 ESV)

and here is what R.C. Sproul says about this encounter in his book The Holiness of God as quoted by Challies

If ever there was a man of integrity, it was Isaiah ben Amoz. He was a whole man, a together type of a fellow. He was considered by his contemporaries as the most righteous man in the nation. He was respected as a paragon of virtue. Then he caught one sudden glimpse of a holy God. In that single moment, all of his self-esteem was shattered. In a brief second he was exposed, made naked beneath the gaze of the absolute standard of holiness. As long as Isaiah could compare himself to other mortals, he was able to sustain a lofty opinion of his own character. The instant he measured himself by the ultimate standard, he was destroyed—morally and spiritually annihilated. He was undone. He came apart. His sense of integrity collapsed.

what would our reaction be? compare Job’s, Daniel’s, and Peter’s to Isaiah’s.

Do we really grasp the holiness of God? Do we even want to do so?