Matthew Poole and continuators on John 12:39

39 Therefore they could not believe , because that Esaias said again ,

Some will have, they could not hear, to be the same with they did not, as Mar. 6.5. it is said Christ could not do mighty works at Nazareth: Or the same with they would not, as Gen. 19.22. but this seemeth an hard Interpretation of [non-Latin text not transcribed]. It is most certain, that in all there is a natural impotency and disability to believe; but this Text seemeth to speak of a further degree of impossibility, than that, occasioned through their wilful obstinacy, and Gods judicial hardning of them.

Because Isaias said, is no more than, for Isaias said; the particle doth not denote the cause influencing them, but the effect of a Prophecy: Gods word (saith the Evangelist) must be made good, and Isaias had Prophecied of what now came to pass.