Seperated unto the Lord

Num 6:8
"All the days of his separation he shall be holy to the LORD"

What does it mean to be separated? that means sacrifice, and sacrifice is so hard sometimes. To be completely set apart for God there must be cost involved.
looking at the world we see that we are to an extent separated but what does it mean to "be holy to the lord"? have we really separated ourselves from the world? are we completely severed?
too often in my own life do I feel i honestly have not been separated enough, obviously we can deny that fact that we live in a dark world and live in a "fairy tale land" but we must make sure that our daily lives are not of the world and not in the world(1Jo 2:16)
I feel so over whelmed by this concept of complete separation and as I read the word daily I see more and more ways to be separated from the world, even in the christian walk we tend to be painted by the world and not reaching the total fullness of Christ. My hearts desire is for the body of Christ to not be tinted by the world but rather be shiners of light in a dark age to come. We are to be separated unto the Lord!
that my friend is a daily battle and only in Christ will we accomplish it, it all starts with seeking the lord and being convicted of how we as a body are painted by the world. We must take that vow mentioned in numbers and we must offer everything as loss.