What do I know of Holy?

What do I know of Holy?  The words to that popular song haunt me, day and night.  I've awakened in the middle of the night for the past couple of nights and can barely get back to sleep just thinking about God's holiness.

Learning about holiness is going to be my quest.  I want to learn about God's holiness and how that relates to us.  His holiness sets Him apart.  

Here are the definitions of Holy from the dictionary:

ho·ly  (hl)

adj. ho·li·er, ho·li·est

1. Belonging to, derived from, or associated with a divine power; sacred.

2. Regarded with or worthy of worship or veneration; revered: a holy book.

3. Living according to a strict or highly moral religious or spiritual system; saintly: a holy person.

4. Specified or set apart for a religious purpose: a holy place.

5. Solemnly undertaken; sacrosanct: a holy pledge.

6. Regarded as deserving special respect or reverence: The pursuit of peace is our holiest quest.

7. Informal Used as an intensive: raised holy hell over the mischief their children did.

I'm pretty sure that none of these capture what God's holiness is.  I am fascinated by the idea of being in God's presence, experiencing the holiness of God.  Lately I found myself dreaming of being in the presence of God, worshipping at His feet and what that must be like.  

So I do not have any answers, only questions tonight.  What do I know of Holy?