Charles Ellicott Commentary Romans 10:14

"How then shall they call on him in whom they have not believed? and how shall they believe in him whom they have not heard? and how shall they hear without a preacher?" — Romans 10:14 (ASV)

Thus there is a distinct order—belief, confession, invocation. But before either the last or the first of these steps is taken the gospel must be preached. The Jew, however, cannot plead that the gospel has not been preached to him. It has been preached both to Jew and Gentile. Both Moses and Isaiah had foretold the conversion of the Gentiles, and Isaiah had also foretold the unbelief of the Jews.