Colossians is a great book for helping us to live eternally now. Paul instructs us to concentrate on the eternal realities of heaven. “Set your minds on things above” The Greek verb for set emphasizes an ongoing decision. Christians must continually discipline themselves to focus on eternal realities instead of the temporal realities of this earth.“
“If then you have been raised with Christ, seek the things that are above, where Christ is, seated at the right hand of God. Set your minds on things that are above, not on things that are on earth. For you have died, and your life is hidden with Christ in God. When Christ who is your life appears, then you also will appear with him in glory.
Put to death therefore what is earthly in you: sexual immorality, impurity, passion, evil desire, and covetousness, which is idolatry. On account of these the wrath of God is coming. In these you too once walked, when you were living in them. But now you must put them all away: anger, wrath, malice, slander, and obscene talk from your mouth. Do not lie to one another, seeing that you have put off the old self with its practices and have put on the new self, which is being renewed in knowledge after the image of its creator. Here there is not Greek and Jew, circumcised and uncircumcised, barbarian, Scythian, slave, free; but Christ is all, and in all.” Colossians 3:1-11
Use of old self and new self. These two terms do not refer to the Christian’s fleshly and spiritual natures. Instead, Paul describes our former unredeemed life as the old self and our life as God’s child as the new self. The new self has the image of the new creation in Christ, just as the old self bears the image of our fallen nature. The old self is under an old master, Satan, while the new self has a new master, the Holy Spirit of God living within.