And being fully persuaded that, what he had promised, he was able also to perform.
All Commentaries on Romans 4:21 Go To Romans 4
Augustine of Hippo
AD 430
God brings about the faith of the Gentiles, because he is able to perform what he has promised. If it is God who produces our faith, acting in a wondrous manner in our hearts so that we believe, surely we should not fear that he cannot do the entire work.