(Rom 8:9) “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.” Notice that if one does not have the Spirit of Christ (the Holy Spirit) then one is not saved. It is He, the Spirit of God, that gives spiritual life. Since He is God, He therefore is Holy. You can see how the saved would question the salvation of one who still demonstrates the desire for the flesh (unholiness) over the desire for God (holy living).