Holiness is about developing Christian character.  It is about transformation to the mind of Christ.  It is about turning away from cultural conformity that compromises who we are supposed to be as those being remade in the divine image.  It is about being Christian in more than name.  It is about being in-dwelt by the Holy Spirit, who is within us to reshape us.  It is about loving God with all your being and putting out everything to the contrary.

“But just as he who called you is holy, so be holy in all you do; for it is written: “Be holy, because I am holy.” 1 Peter 1:15-16 (NIV)