You, however, are controlled not by the sinful nature but by the Spirit, if the Spirit of God lives in you. (Romans 8:9 NIV)
Perhaps the major problem of most of the Lord’s people is to keep that line of division between what we are in ourselves and what Christ is in us. The great line of attack on the part of the enemy is to bring what we are ourselves continually up into view and occupy us with that, and by so doing obscure Christ. The great object of the Holy Spirit in His opposing of Satan is to bring Christ into view and to occupy us with Him to the obscuring of ourselves. That is where the great difficulty arises for most of the Lord’s people. There is always this beat back, this drive back to get us occupied with ourselves, as to what we are, to keep us from being occupied with Christ and what He is; in some way to get that gap, that gulf, that separation filled up, and the line of demarcation obliterated, so that there is confusion. God begins with the Firstborn. That implies something altogether other than what we are, and it is important to see what God says, and how God views those who are represented as being in Christ, and in whom Christ is....
When Christ is in us, God views us through Christ. Oh, that we might recognize this, that in Christ in us, there is the embodiment of God’s thought, and He is able to speak so of us. His activities with us are all in relation to the Christ who is now by the Holy Spirit in us, and in Whom we are. The fact that the Firstborn is invariably connected with death and resurrection is God’s way of saying that what we are in ourselves by nature is buried from His standpoint, and it is His Son alone who obtains where we are concerned as a risen One, the only One who lives before Him. All else are dead and buried in the sight of God, and God would have us take that attitude. Remember that we are dead and buried.
By T. Austin-Sparks from: The Church of the Firstborn - Chapter 1