We are holy, because He is holy, we strive for holiness because we press forward to who we are in Christ. But we are not unholy trying to be holy, we are holy living out of who we are in Christ.
Scripture gives the identity. Then it gives the exhortation to what it looks like to live out of that identity. If we miss the identity before we give the exhortation, we put people into a command without the power to perform it. If we give identity without the exhortation, we miss maturing correction which aligns people to who they are in Christ.
Please remember we are babes in Christ when we first come to the Lord. When believers did things that were NOT holy then the writers of Scripture corrected their identity and then their behavior. Both are needed.
Here are a few Scriptures to show this pattern...
He is holy, thus we are holy:
1 Peter 1:14-16 As obedient children, do not be conformed to the passions of your former ignorance, but as he who called you is holy, you also be holy in all your conduct, since it is written, “You shall be holy, for I am holy.”
Promise of holiness:
Since we have these promises, beloved, let us cleanse ourselves from every defilement of body and spirit, bringing holiness to completion in the fear of God.
This is the same idea, bring holiness to completion:
Strive for peace with everyone, and for the holiness without which no one will see the Lord.
We are a chosen holy nation:
But you are a chosen race, a royal priesthood, a holy nation, a people for his own possession, that you may proclaim the excellencies of him who called you out of darkness into his marvelous light.
God has not called us (not calling us):
For God has not called us for impurity, but in holiness.
Chosen ones, we are holy and beloved, this is what holiness looks like:
Put on then, as God's chosen ones, holy and beloved, compassionate hearts, kindness, humility, meekness, and patience, bearing with one another and, if one has a complaint against another, forgiving each other; as the Lord has forgiven you, so you also must forgive. And above all these put on love, which binds everything together in perfect harmony. And let the peace of Christ rule in your hearts, to which indeed you were called in one body. And be thankful.