But we all, with open face beholding as in a glass the glory of the Lord, are changed into the same image from glory to glory, even as by the Spirit of the Lord. 2 Corinthians 3:18
Sanctification is the progressive setting apart of the believer from sin. This is the work of the Holy Spirit to make us more like Jesus Christ. As we pursue the will of God, submitting to his direction and guidance we continue to transform to be more like Christ during our time here on earth. I have experienced sanctification and can attest it amazingly transforms who you are. Believe and trust in Jesus, submit to the will of God, and you will be changed.