Romans 10:12 - Matthew Poole's English Annotations on the Holy Bible

For there is no difference between the Jew and the Greek: he gives a reason for that universal term, whosoever, which he had added in the precedent verse, and is not found in Isaiah, as was noted before, in Romans 9:33. The same Lord over all; these words are a reason why there is no difference now between Jew and Greek. This title is to be referred more especially to Jesus Christ, who was called Lord, Romans 10:9, and is called: Lord of all, Acts 10:36. He is Head of all the elect, in all nations of the world. Is rich unto all; i.e. is bountiful unto all. So that the Jews need not envy the calling or coming of the Gentiles; they have never the less themselves; the Lord hath an inexhaustible store of grace and mercy. The fountain is above our thirst. That call upon him; not to all, hand over head, but to such as call upon him in faith.