The sin nature is like a human nature, but its warped/perverted/twisted/corrupted form of a human nature. The sin nature is what the death of Christ was for, in that I was condemnable. My condemnation fell upon His human body which had no perverted/warped/corrupted/twisted human nature, which makes the penalty for my nature already distributed to someone else (and I get away Scott free!)
The sin nature is a source of thoughts in the mind, which thoughts are “epithumia’s Gk.” or simply cravings.
The works of the flesh are found in Galatians 5:19-21. Each of these works begin as “lusts” in the mind and either find fulfillment in being acted out, or they are thwarted in the mind before their fulfillment (gratification).
The sin nature is not overcome by the armor of God, but has a distinctly different defense. Adultery, fornication, uncleanness, licentiousness, idolatry, sorcery, enmities, strifes, jealousies, indignations, contentions, divisions, sects, envyings, murders, drunkennesses, revels, and things like these are overcome by an act of the will which is to walk by the Spirit. Satan’s lusts/solicitations to evil/cravings/strong desires which he places into our minds are not these things listed.