Albert Barnes on Romans 1:15

So, as much as in me is. As far as opportunity may be offered, and according to my ability.

I am ready, etc. I am prepared to preach among you, and to show the power of the gospel, even in the splendid metropolis of the world. He was not deterred by any fear; nor was he indifferent to their welfare; but he was under the direction of God, and as far as he gave him opportunity, he was ready to make known to them the gospel, as he had done at Antioch, Ephesus, Athens, and Corinth.

This closes the introduction or preface to the epistle. Having shown his deep interest in their welfare, he proceeds in the next verse to state to them the great doctrines of that gospel which he was desirous of proclaiming to them.