Cap. VIII Arg. 5: Jewish unbelief (Rom. 9:32; 11:19-20) said to be cause of reprobation
Fifth: from the same Apostle they try to prove remaining in unbelief is the cause of reprobation, since he casts the Jews' reprobation back on their unbelief as cause (Rom. 9:31-32): Israel, pursuing the law of righteousness, did not arrive at it — Why? Because not of faith. Confirmed by Rom. 11:19-20: The branches were broken off that I might be grafted in — Well: because of unbelief they were broken off; but you stand by faith. Sum: the Jews were reprobated for final perseverance in unbelief; therefore that perseverance is the cause of divine reprobation.
Latin
Ex eodem Apostolo conantur demonstrare, permansionem in infidelitate esse reprobationis causam; quoniam reprobationem Judaeorum rejicit in infidelitatem eorundem tanquam causam: Rom. ix. 31, 32. Israel, inquit, sectando legem justitiae, in legem justitiae non pervenit. Quare? Quia non ex fide. Ubi indicatur solutio quaestionis de causa reprobationis Judaeorum. Quod ipsum confirmatur ex illis verbis, Rom. xi. 19, 20. Dices, Fracti sunt rami, ut ego inserar. Bene: propter incredulitatem fracti sunt: Tu autem fide stas, etc. Summa argumenti haec est: Judaei reprobati fuerunt propter perseverantiam finalem in infidelitate sua: Ergo perseverantia haec in infidelitate est causa reprobationis Divinae.