The term “sanctification” is used in two ways.
1. Separation to God.
2. The course of life befitting these so separated.
There is also the manward aspect. Sanctification of a believer is demonstrated as he separates himself from evil things and evil ways. This sanctification is God’s will for each believers 1 Thessalonians 4:3. Our sanctification is one of God’s purposes in calling us by the Gospel. See verse 7.
Sanctification is taught in the word and comes by the applying of the word to our daily lives; John 17:17. We are exhorted to follow and grow in holiness (Hebrews 12-14). The Holy Spirit is the agent in sanctification (Romans 15:16). Being sanctified by the Holy Spirit. Also see 1 Corinthians 6:11.
The word is used 10 times in the New Testament, 5 times it is translated sanctification and 5 times believers.
The subject of sanctification and consecration run side by side.
At conversion we were saved – justified – sanctified by God. Sealed – Baptized – filled – sanctified – by spirit.