Gospel Righteousness Revealed

It is said that John Bunyan was so inspired as he read the great themes of Romans in the Bedford Jail that he wrote the immortal Pilgrims Progress (R.Kent Hughes)
In order to provide a helpful introduction to this passage, the following basic division is given:
The Promise of the Gospel 1:1-7
The Preaching of the Gospel 1:8-15
The Power of the Gospel 1:16,17