Paul's Struggle with Indwelling Sin

Paul's Struggle with Indwelling Sin:

First, in vv 15-17 - Paul's struggle to do what he knew that he should do and also avoid doing what he knew that he shouldn't do.

Second, in vv 18-20 - Paul's struggle to come to grips with repeated personal failure.

Third, in vv 21-23 - Paul's struggle with internal, spiritual warfare.