1 Corinthians 1:2
To the church of God which is at Corinth, to those who have been sanctified in Christ Jesus,…
The real you, the spirit man on the inside has been sanctified in Christ. The word sanctified means to be set apart and dedicated unto God. Sanctification of our spirit man was God’s part, now we respond by sanctifying our soul and bodies. Jesus in praying for His disciples said in John 17 that we would be in the world but not of the world. In His prayer He prayed we would be sanctified by God’s Truth, for His Word is Truth.
2 Corinthians 7:1 – Therefore, having these promises, beloved, let us cleanse ourselves from all filthiness of the flesh and spirit, perfecting holiness in the fear of God.
We are to cleanse our life from all filthiness of flesh and spirit. The fleshly part deals with the sins of the flesh. The spiritual part deals with things that are harmful to you spiritually, such as false teachings and just wanting your ears tickled. Don’t fall for the “feel good” preachers who won’t teach you how to get free from the old fleshly nature.
When you know the full Truth of God’s Word, the Truth sets you free. If we will learn from the Word who we now are in Christ on the inside, and become doers of the Word and not just hearers only, we will be set apart by the Truth on the outside. Become one with the Word of God by hearing and doing the Truth, and you will live a life set apart from the world.