"You shall be holy, for I, the Lord your God, am holy."
This lofty command from God (Leviticus 19:2) is not a call to high moral behavior. It is a call to loving surrender. When the Bible says that God is holy it means that God is totally Other, entirely separate from all that is not divine.
We humans are not called to be holy in this sense. Holiness in humans is the state of belonging to the Divine, being designated God's very own property. It is not earned by our moral behavior. God lives within us and graciously claims us as God's own. What is required of us is surrender. Our unearned goodness flows from that union.