However, you are not [living] in the flesh [controlled by the sinful nature] but in the Spirit, if in fact the Spirit of God lives in you [directing and guiding you]. But if anyone does not have the Spirit of Christ, he does not belong to Him [and is not a child of God]. If Christ lives in you, though your [natural] body is dead because of sin, your spirit is alive because of righteousness [which He provides]. And if the Spirit of Him who raised Jesus from the dead lives in you, He who raised Christ Jesus from the dead will also give life to your mortal bodies through His Spirit, who lives in you. (Romans 8:9-11)
You have been released from the mortal decay of bondage to your sinful flesh. You are not recognized as being there anymore. For your life is now completely in Christ Jesus, who took the punishment for your sin, so that your Father can now declare you righteous in His sight. This is His free gift to you, for He did for you what was impossible for you to do for yourself, and now He desires for you to fully know Him, just as you are fully known.
You are now called to live your life according to His Spirit and be guided by His power within you so that you will not return to your former ways. Your flesh is hostile towards God, but your spirit can now choose to please God as you abide with Him. If this is new to you, then God will show you how to set your mind on things above, and He will teach you how to follow in His ways.
The same Spirit who raised Christ Jesus from the dead now dwells within you, and He sustains your mortal body as you remain with Him. Allow the Holy Spirit to lead you into abundant living, so that even if you die, yet shall you live. He has been sent to you to teach the things of Jesus, and to remind you of His presence with you wherever you go. So follow Him, so that you can know His ways, please His heart, and be filled with His presence.