"For the mind set on the flesh is death, but the mind set on the Spirit is life and peace,..." (Romans 8:6)
To be a Christian is to be one who does not think like the world. The Spirit of God has taken up residency in a believer and the believer has become someone new. A Christian is a follower and learner of Jesus Christ. They have the seed of Christ in them and therefore the manifestation of the life in them will be how they think and act. A Christian does not think or act according to the prince and power of this world but according to the Spirit of God which now dwells in them and is revealed to them through the written word of God. The world's way is of flesh and demonic but God's way is Spirit and life and peace. Let us walk according to the Spirit of God which now dwells in those who believe.