In our minds holiness is usually about what we abstain from.
But Jesus saw holiness as what you give yourself to. (Namely, justice, mercy, compassion, love & hospitality.)
In the end, the holiest people are the ones who love well.
The gospel is incomplete and incapable of being embodied without the good news of the coming of the Holy Spirit.
Through the Holy Spirit, God does in us, what Christ has done for us.