Romans 8:8 So then they that are in the flesh cannot please God. 9 But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his. Paul divides humanity into two distinct classifications. (1) in the flesh; (2) in the Spirit. In the flesh refers to our natural state as we are born physically into this world with all the physical attributes that come with physical birth. All human beings come into this world "in the flesh." In the Spirit refers to those natural born human beings who have been supernaturally born of the Spirit or had a second birth in addition to human birth. Those born merely "in the flesh" cannot please God according to verse 8 and the reason they cannot please God is described in verse 7. Those who come natural born "in the flesh" are born into this world with "enmity" toward God and will not submit to the law of God. You never have to teach a child to do evil - it comes natural. What you must do is discipline them and teach them to do good and that job is never accomplished "in the flesh." There are only two types of human beings (1) lost versus saved (2) Children of God versus children of Satan; (3) unregenerated versus regenerate; (4) in the Spirit versus in the flesh. There is no third category of humanity. Paul says to be "in the Spirit" is one and the same to have the Holy Spirit indwelling you. 9 But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his Indeed, eternal life is to be in SPIRITUAL UNION with God and to be "separated from the life of God" is to be SEPARATED from the Spirit of God as eternal life is "in the Spirit" or in UNION WITH THE HOLY SPIRIT. One cannot be in UNION with the Spirit of God without the Holy Spirit indwelling them permenantly as any time they are separated from the Spirit of God they are no longer in SPIRITUAL UNION with God and thus separated and without eternal life. Old Tesament saints were in SPIRITUAL UNION with God, they had the permenant indwelling Spirit of God and the evidence is their lives produced the fruits of the Spirit (Heb. 11:4-40). The Spirit came "upon" them as the Spirit came "upon" those in Acts 8:14-15 for empowerment in performing some service of God or in spiritual gifts to do the will of God. It is impossible to belong to God apart from the permenant indwelling Spirit of God as it is impossible to have spiritual life apart from permenant Spiritual Union with God. Any man who is without the indwelling Spirit of God regardless when he lives is "none of his" - Rom. 8:9 and is still "in the flesh." All the elect, the elect in the Old Testament, in the New Testament were chosen "IN HIM" before the foundation of the world (Eph. 1:4). There is NO SPIRITITUAL LIFE outside of Christ. Abraham was "in Christ" by faith (Gal. 3:17). You cannot be "in Christ" and not be indwelt by the Spirit of Christ and neither can you have eternal life apart from UNION with God and you cannot have union with God apart from SPIRITUAL UNION and you cannot have spiritual union apart from the indwelling Spirit of Christ - Rom. 8:8-9.