That is the key and Holy Word, my friend. Ultimately, this Holy Separation revolves around two key things:
1) The Curse of the Lord
2) Worldly laws
Galatians 3:13 NLT - "But Christ has rescued us from the curse pronounced by the law. When he was hung on the cross, he took upon himself the curse for our wrongdoing. For it is written in the Scriptures, "Cursed is everyone who is hung on a tree."
Romans 7:6 NLT - "But now we have been released from the law, for we died to it and are no longer captive to its power. Now we can serve God, not in the old way of obeying the letter of the law, but in the new way of living in the Spirit."
There are MANY passages just like the two above, but written in a completely different way. Below is but another:
2 Corinthians 3:13-17 NLT - "We are not like Moses, who put a veil over his face so the people of Israel would not see the glory, even though it was destined to fade away. But the people's minds were hardened, and to this day whenever the old covenant is being read, the same veil covers their minds so they cannot understand the truth. And this veil can be removed only by believing in Christ. Yes, even today when they read Moses' writings, their hearts are covered with that veil, and they do not understand. But whenever someone turns to the Lord, the veil is taken away. 17 For the Lord is the Spirit, and wherever the Spirit of the Lord is, there is freedom."
And another:
Genesis 3:22 NLT - "Then the LORD God said, "Look, the human beings have become like us, knowing both good and evil. What if they reach out, take fruit from the tree of life, and eat it? Then they will live forever!"
And another:
Colossians 2:11-13 NLT - "When you came to Christ, you were "circumcised," but not by a physical procedure. Christ performed a spiritual circumcision--the cutting away of your sinful nature. For you were buried with Christ when you were baptized. And with him you were raised to new life because you trusted the mighty power of God, who raised Christ from the dead. You were dead because of your sins and because your sinful nature was not yet cut away. Then God made you alive with Christ, for he forgave all our sins."
This is the Heart of the Bible . . . to be Spiritually Circumcised . . . to be Separated . . . to become a Nazarene like Christ, our Powerful, Almighty God.