World Wide Study Bible
a Bible passage
12. For there is no difference—or "distinction"
between Jew and Greek; for the same Lord over all—that is, not God (as Calvin, Grotius, Olshausen, Hodge), but Christ, as will be seen, we think, by comparing Ro 10:9, 12, 13 and observing the apostle's usual style on such subjects. (So Chrysostom, Melville, Bengel, Meyer, De Wette, Fritzsche, Tholuck, Stuart, Alford, Philippi).
is rich—a favorite Pauline term to express the exuberance of that saving grace which is in Christ Jesus.
unto all that call upon him—This confirms the application of the preceding words to Christ; since to call upon the name of the Lord Jesus is a customary expression. (See Ac 7:59, 60; 9:14, 21; 22:16; 1Co 1:2; 2Ti 2:22).