If, then, all "the rest," in the salvation of whom the election of God does not reign, are "blinded," it is doubtlessly and undeniably manifest that those same persons who, by their rebellion and provocation of the wrath of God, procured to themselves this additional blindness, were themselves from the beginning ordained to blindness. -- John Calvin
The third account or cause why we are in error, according to our worthy friend Georgius, is because, though the Scripture does indeed make mention of men being "blinded" and hardened," yet we do not bear in mind that such greater punishments are inflicted on sins of greater magnitude. We, however, on our part, do not deny that which is clearly confirmed by numberless testimonies of the Scripture, that God punishes with blindness, and with many other modes of judgment, contempt of His grace, pride, obstinacy, and many other kindred sins. And, indeed, all those conspicuous punishments, of which mention is made throughout the Scriptures, ought to be referred to that general view of the righteous judgment of God in the display of which we ever see, that those who have not duly feared God, after they had known Him, nor have reverenced Him as they ought, have been "given over to a reprobate mind," and left to wallow in every kind of uncleanness and lust. But on this deep subject we shall dwell more fully hereafter.Although, therefore, the Lord doth thus strike the wicked with vindictive madness and consternation, and doth thus repay them with the punishment they deserve; yet this does not at all alter the fact that there is, in all the reprobate generally, a blindness and an obstinate hardness of heart. So, when Pharaoh is said to have been "hardened" of God, he was already, in himself, worthy of being delivered over unto Satan by the Most High. Moses, however, also testifies that Pharaoh had been before blinded of God "for this very purpose" (Exod. ix. 16). Nor does Paul add any other cause for this, than that Pharaoh was one of the reprobate (Rom. ix. 17). In this same manner also does the apostle demonstrate that the Jews, when God had deprived them of the light of understanding, and had permitted them to fall into horrible darkness, suffered thereby the righteous punishments of their wicked contempt of the grace of God. And yet the apostle plainly intimates that this same blindness is justly inflicted of God upon all reprobates generally. For he testifies that the "remnant were saved "according to the election of grace," but that all "the rest were blinded." If, then, all "the rest," in the salvation of whom the election of God does not reign, are "blinded," it is doubtlessly and undeniably manifest that those same persons who, by their rebellion and provocation of the wrath of God, procured to themselves this additional blindness, were themselves from the beginning ordained to blindness.
John Calvin: A Treatise of the Eternal Predestination of God. Section VI