I love that. This is what Dr Harville Hendrix and his wife Helen Hunt show you in your daily life and through the dialog you can no longer be confused with the old brain and make right choices no longer under the control of your childhood wounds. I think this is what Paul was facing when he wrote this. But of course it's still very much under dissection what he truly meant.

To my understanding it refers to our complete inability to quit sinning while trapped in our imperfect flesh. It is only in the blink of an eye when we go from corruptible to incorruptible, that we can ever be fully free from sin. No matter how perfect we want to be, Jesus was the only one who was able to maintain perfection in a human body.