The Holy One created in order to be known and, much more than that, to be one with those He created in His image.
When Adam separated himself and his descendants from God, the Lord drove the man and the woman away from the Tree of Life, so that they would not live forever, apart from Him (Gen 3:22-24). He did this only after promising the Savior Who would come from the seed of the woman and would crush the Serpent’s head (Gen 3:15).
God’s revelation of Himself as holy qãdôš is drawn from the Akkadian qadistu (an adjective, describing something or someone who is “pure” or “devoted”) as well as the Arabic al-qaddus, (a noun, expressing the existence of pure holiness). The meaning “separate” or “set apart” is necessarily a derived meaning of qādôš because sin may not exist in God’s presence (Vine’s Expository Dictionary).
As Infinite Spirit, God is present everywhere. At the same time, because He is holy, He holds and maintains Himself separate or set apart from sin and evil and from all who oppose His holy will.
“Your eyes are too pure to behold evil” (Hab 2:13).
“No evil dwells with You” (Ps 5:6).
God’s holy separateness is not the same as God’s self-existence — His uniqueness as Creator, existing before all things as the Eternal and as the only Person in the universe who is not created and dependent. God’s separateness refers to the expression of His Holiness in relating to His creation.
(Spotlight 2, Lesson 8 in Doctrine 101: Learning about God)