“Consecrate yourselves and be holy, because I am the Lord your God. Keep my decrees and follow them. I am the Lord, who makes you holy."
The mere fact that there exists a God in heaven necessitates the existence of a holy people, a people called and separated from the world for the Lord's purposes. Israel exists and on a larger scale the Church exists because God exists. The mere fact that the Church is alive today in face of sin and adversity pays tribute to the fact that there is one creator God who makes us, saves us, and sustains us.
He is also the God who sanctifies us, "the Lord who makes us holy" because God alone is holy. God is holy because God is. Holy is his identity so that all might confess, "Holy, Holy, Holy is the Lord God almighty". God's holiness is not an incomprehensible abstract quality but rather is bound and made manifest in his relation to Himself as the holy Trinity and to us who are made in his holy image.
And God's holiness opposes those who do not respond appropriately to Him, i.e. bearing the fruit of life through the reflection of that which is Life (God), worshiping in Spirit and in Truth. Anything short of this reflection of God in us is a denial of God's glorious reality and thus a denial of our own humanity. To worship God in obedience is to be fully human. It is to truly live.