Perhaps you may recognize this condition in particular relating to the Jews:Neither of those indicate that we need to be regenerated in order to receive the Gospel. Eph. 2:8,9 is about the fact that we are not saved by works, but are saved by grace through faith. I Cor. 2:14 says that the natural man cannot receive the things of God, but that is in a context discussing the deep spiritual truths of Scripture. It does't mean that he has to be regenerated to hear and receive the Gospel message.
But their minds were hardened. For to this day, when they read the old covenant, that same veil remains unlifted, because only through Christ is it taken away.
If such is the condition of those charged with carrying the very “oracles of God,” how much worse condition is found of those who are also unregenerate.