That is not contrary to my original statement..."The nature of the new birth/new man is not wanting to sin."On the contrary:
Paul wrote in Romans chapter 7, that after we have been saved, there is a continuing conflict between the flesh and the Spirit - in choosing to walk in the flesh and live in sin - or choose to walk after the Holy Spirit (that now dwells in us) - and Paul warns us in Romans 8, that choosing to live in sins (works of the flesh), will keep us out of heaven:
Elsewhere I have quoted...
Galatians 5:17 (KJV) For the flesh lusteth against the Spirit, and the Spirit against the flesh: and these are contrary the one to the other: so that ye cannot do the things that ye would.
Though we have a new nature (new desires) the battle remains.