In him shall the Gentiles trust— Rather hope, says Mr. Locke: not that there is any material difference in the signification of trust and hope, but the better to express and answer St. Paul's way of writing; with whom it is familiar, when he has been speaking of any virtue or grace, whereof God is the author, to call God thereupon the God of that virtue or grace. So, Romans 15:13, he calls God the God of hope. See also Romans 15:4-5.
Related Commentaries of Romans 15:12
Romans 15:12
12 And again, Esaias saith, There shall be a root of Jesse, and he that shall rise to reign over the Gentiles; in him shall the Gentiles trust.