The apostle having insinuated, Romans 3:3, that God would cast off the Jews for their unbelief, a Jew is there supposed to object, that their rejection would destroy the faithfulness of God. To this the apostle answered, that the faithfulness of God would be established rather than destroyed, by the rejection of the Jews for their unbelief; because God had expressly declared, Genesis 18:19, that Abraham's children were to keep the way of the Lord, in order to their obtaining the promised blessings; and had thereby insinuated, that if they did not keep that way they would lose blessings, of which their being made the visible Church of God was one. This was all the answer the apostle thought proper to make in that part of his epistle. But the objection being specious, and, it seems, much insisted on by the unbelieving Jews, he introduces it a second time in this place, that he might reply to it more fully: this then is the subject of this chapter. The apostle shows therein, in answer to the objection of his countrymen, that the rejection of the unbelieving Jews from being the Church of God, and the reception of the believing Gentiles to be his people in their stead, was not contrary to the word of God. That the apostle had not here the least thought of personal election or reprobation, is manifest, 1st, Because it lay quite wide of his design, which, as has been just observed, was merely to show that God's rejecting the Jews, and receiving the Gentiles, was consistent with his word: 2d, Because such a doctrine would not only have had no tendency to convince, but would have evidently tended to harden the Jews: 3d, Because when he sums up his argument, in the close of the chapter, he says not one word, nor gives the least intimation about it.
I say the truth in Christ This being a solemn appeal to Christ and the Holy Ghost, as knowing the apostle's heart, for the truth of what he affirmed, it is of the nature of an oath. I lie not That which he had in the former clause expressed in the affirmative, he in this emphatically confirms in the negative, according to the manner of the Hebrews, who were wont to deliver, as well negatively as affirmatively, what they judged to be worthy of special observation. My conscience also bearing me witness As to the truth of what I say; in the Holy Ghost Who searches all hearts, and perfectly knows whether the soul on which he operates be sincere. That I have great heaviness, &c. Greek, οτι λυπη μοι εστι μεγαλη, και αδιαλειπτος οδυνη τη καρδια μου, that I have great grief, and unceasing anguish in my heart This is the fact, the belief of which the apostle desired to procure by that solemnity of attestation expressed in the preceding verse: he does not here mention the cause of his grief and anguish, but it is evident from the first verse that the cause was their obduracy, and rejection as a nation, and the many miseries which he foresaw to be coming upon them. By thus declaring his sorrow for the unbelieving Jews, who excluded themselves from all the blessings he had enumerated in the former part of his epistle, he shows that what he was now about to say, he did not speak from any prejudice to them.