So now there is no condemnation for those who belong to Christ Jesus. And because you belong to him, the power of the life-giving Spirit has freed you from the power of sin that leads to death. The law of Moses was unable to save us because of the weakness of our sinful nature. So God did what the law could not do. He sent his own Son in a body like the bodies we sinners have. And in that body God declared an end to sin’s control over us by giving his Son as a sacrifice for our sins. He did this so that the just requirement of the law would be fully satisfied for us, who no longer follow our sinful nature but instead follow the Spirit. Those who are dominated by the sinful nature think about sinful things, but those who are controlled by the Holy Spirit think about things that please the Spirit. So letting your sinful nature control your mind leads to death. But letting the Spirit control your mind leads to life and peace. For the sinful nature is always hostile to God. It never did obey God’s laws, and it never will. That’s why those who are still under the control of their sinful nature can never please God. But you are not controlled by your sinful nature. You are controlled by the Spirit if you have the Spirit of God living in you. (And remember that those who do not have the Spirit of Christ living in them do not belong to him at all.) And Christ lives within you, so even though your body will die because of sin, the Spirit gives you life because you have been made right with God. The Spirit of God, who raised Jesus from the dead, lives in you. And just as God raised Christ Jesus from the dead, he will give life to your mortal bodies by this same Spirit living within you. (Romans 8:1-11 NLT)
Paul divides people into two categories – those who let themselves be controlled by their sinful natures, and those who follow after the Holy Spirit. All of us would be in the first category if Jesus hadn’t offered us a way out. Once we have said yes to Jesus, we will want to continue following him, because his way brings life and peace. Daily we must consciously choose to center our lives on God. Use the bible to discover God’s guidelines, and then follow them. In every perplexing situation ask yourself, “What would Jesus want me to do?” When the Holy Spirit points out what is right, do it eagerly.
When the Holy Spirit is working within you, you will believe that Jesus Christ is God’s son and that eternal life comes through him, you will begin to act as Christ directs, you will find help in your daily problems and in your praying, you will be empowered to serve God and do his will, and you will become part of God’s plan to build up his church.
The Holy Spirit is God’s promise or guarantee of eternal life for those who believe in him. The Spirit is in us now by faith, and by faith we are certain to live with Christ forever.