One of those who say that sin/the old nature/old man has been literally destroyed and is truly dead...removed...gone...eradicated...and so nothing's left but the new.
Yep, there it is; described in Romans 6-8 as ever itchin to "revive" once more.
The thing is obviously dormant (like some sort of an indwelling troll ever under the bridge of one's conscious radar; just waiting to be stirred out of its sleep, to wreak its havoc; charge it's death toll), not dead, let alone; eradicated.
One infirmity one ever needs to be mindful of...
Romans 6:19 I speak after the manner of men because of the infirmity of your flesh: for as ye have yielded your members servants to uncleanness and to iniquity unto iniquity; even so now yield your members servants to righteousness unto holiness.
"Ya know that old habit of yours; well from here on out you're to indulge this other nature, instead...."
Rom. 5:8.