“Wherefore? Because they sought it not by faith, but as it were by the works of the law. For they stumbled at that stumblingstone;”
King James Version (KJV)
9:32 And wherefore have they not? Is it because God eternally decreed they should not? There is nothing like this to be met with but agreeable to his argument the apostle gives us this good reason for it, Because they sought it not by faith - Whereby alone it could be attained. But as it were - In effect, if not professsedly, by works. For they stumbled at that stumblingstone - Christ crucified.
Ro 9:32 Wherefore? Why this failure on the part of Israel? Not because God willed that they should be rejected, not because of any foreordination, but because of their unbelief in Christ. Because [they sought it] not by faith. Sought not the righteousness that comes from faith in Christ, but a righteousness of works by keeping the law of Moses. They stumbled at the stumblingstone. At faith in Christ, in a Crucified Christ. This is one cause of Israel's failure. This is the one cause of Israel's failure. They fell through unbelief.