Heb 12:14 Make every effort to live in peace with everyone and to be holy; without holiness no one will see the Lord.
1 Peter 1:15 But just as he who called you is holy, so be holy in all you do;
Holiness is God's Holy (set apart) nature. God is Holy. Taking God's holiness upon ourselves results in our sanctification, which is us being separated unto God.
JF Brown Commentary:
"Christians are already holy unto God by consecration; they must be so also in their outward walk and behavior in all respects. The outward must correspond to the inward man."
1 Peter 1:15 But just as he who called you is holy, so be holy in all you do;
Holiness is God's Holy (set apart) nature. God is Holy. Taking God's holiness upon ourselves results in our sanctification, which is us being separated unto God.
JF Brown Commentary:
"Christians are already holy unto God by consecration; they must be so also in their outward walk and behavior in all respects. The outward must correspond to the inward man."