One must read the verses in context. Understanding comes from reading the verses before. Now i will post the verses before in Romans 7 and Romans 8.. I also note that the break between chapter 7 and 8 is artificial they should not be read or studdied in separation they are part of the same all in one message.
So read and understand.
Romans 7
14 For we know that the law is spiritual, but I am carnal, sold under sin. 15 For what I am doing, I do not understand. For what I will to do, that I do not practice; but what I hate, that I do. 16 If, then, I do what I will not to do, I agree with the law that it is good. 17 But now, it is no longer I who do it, but sin that dwells in me. 18 For I know that in me (that is, in my flesh) nothing good dwells; for to will is present with me, but how to perform what is good I do not find. 19 For the good that I will to do, I do not do; but the evil I will not to do, that I practice. 20 Now if I do what I will not to do, it is no longer I who do it, but sin that dwells in me.
Romans 8
4 that the righteous requirement of the law might be fulfilled in us who do not walk according to the flesh but according to the Spirit. 5 For those who live according to the flesh set their minds on the things of the flesh, but those who live according to the Spirit, the things of the Spirit. 6 For to be carnally minded is death, but to be spiritually minded is life and peace.
Romans 8
12 Therefore, brethren, we are debtors—not to the flesh, to live according to the flesh. 13 For if you live according to the flesh you will die; but if by the Spirit you put to death the deeds of the body, you will live.
It is all about attitude towards sin. If we have the right Spirit then we hate sin and love what is good this being Spiritually Minded. But having love for sin and being focused on perusing a life of it is being carnally Minded and that leads to death. Not sin itself but the love of that sin. People who are wilful sinners. meaning they sin in wilful rebellion against the will of God shall die (eternal death) These people live according to the flesh. But those who hate sin and wish to do good they live according to the Spirit.
Those who are carnal minded do not accept God's will, they do not accept the conviction of the Holy Spirit, they do not acknowledge their need to be forgiven through the Messiah Jesus because for them sin is ok.
All Praise The Ancient Of Days
All Praise The Ancient Of Days