Sanctification is by the word and work of God,
through the working of the Holy Spirit.
2 Thessonians 2:
13 But we are bound to give thanks to God always for you, brethren beloved by the Lord, because God from the beginning chose you for salvation through sanctification by the Spirit and belief in the truth,
14 to which He called you by our gospel, for the obtaining of the glory of our Lord Jesus Christ.
15 Therefore, brethren, stand fast and hold the traditions which you were taught, whether by word or our epistle.
16 Now may our Lord Jesus Christ Himself, and our God and Father, who has loved us and given us everlasting consolation and good hope by grace,
17 comfort your hearts and establish you in every good word and work.
1 Thessalonians 4:
1 Finally then, brethren, we urge and exhort in the Lord Jesus that you should abound more and more, just as you received from us how you ought to walk and to please God;
2 for you know what commandments we gave you through the Lord Jesus. (to obey)
3 For this is the will of God, your sanctification: that you should abstain from sexual immorality;
4 that each of you should know how to possess his own vessel in sanctification and honor,
5 not in passion of lust, like the Gentiles who do not know God.