"The elective principle, abolished as to nationality, continues in force as to individuals. And even with respect to national privilege, while temporarily abolished now that its purpose has been fulfilled, there still remains reserved for the future a certain fulfillment of the national elective promise. Israel in its racial capacity will again in the future be visited by the saving grace of God [Rom. 11.2, 12, 25]....
Nevertheless such (Jewish) conversions remain for the present but sporadic examples, though at bottom expressive of a divine principle intended to work itself out on the largest of scales at the predetermined point in the future....
To the events preceding the parousia belongs, according to the uniform teaching of Jesus, Peter, and Paul, the conversion of Israel (Matt. 23:39; Luke 13:35; Acts 1:6,7; 3:19, 21; where the arrival of "seasons of refreshing" and "times of restoration of all things" is made dependent on the [eschatological] sending of the Christ to Israel), and this again is said to depend upon the repentance and conversion and the blotting out of the sins of Israel; Romans 11, where the problem of unbelief of Israel is solved by the twofold proposition: (1) that there is even now among Israel an election according to grace; (2) that in the future there will be a comprehensive conversion of Israel (vss. 5, 25-32)."
(Biblical Theology, Old and New Testaments, (c)1948 Wm. B. Eerdmans Pub. Co., Tenth Printing, p. 79, The Pauline Eschatology, (c) 1979 Baker Book House, p. 88, and Redemptive History and Biblical Interpretation, The Shorter Writings of Geerhardus Vos, p. 35, edited by Richard B. Gaffin, Jr., (c) 1980, Presbyterian and Reformed Pub. Co.)