Here is the reason of the foregoing seeming paradox; why they, who followed after the law of righteousness, should not attain it, rather than other.
Because they sought it not aright; they sought it not in a way of believing, but of working. These two are opposed in the business of justification, as before at large, in Rom_9:3,4.
As it were by the works of the law; i.e. as if they could have attained righteousness or justification in that way, which it was impossible to do.
They stumbled at that stumbling-stone; i.e. the true Messiah: q.d. So far were they from seeking righteousness by Christ, that, on the contrary, they took offence at him, to their own destruction, Mar_6:31Co_1:23. They thought it impossible that he should give them a righteousness better than their own. This happened to them according to the prophecy that went before them: so it followeth;