28 Then Manes answers him: “And what sort of God causes blindness? For it is Paul who says, In whom the God of this world has blinded the minds of them that believe not, lest the light of the Gospel should shine unto them.” But Archelaus made a good retort, saying, Read a little before: But if our Gospel is veiled, it is veiled in them that are perishing. Do you see that in them that are perishing it is veiled? For it is not right to give the things which are holy unto the dogs. Again, Is it only the God of the Old Testament that has blinded the minds of them that believe not? Hath not Jesus Himself said, For this cause speak I unto them in parables, that seeing they may not see? Was it from hating them that He wished them not to see? Or because of their unworthiness, since their eyes they had closed. For where there is wilful wickedness, there is also a withholding of grace: for to him that has shall be given; but from him that has not shall be taken even that which he seems to have.
Source: Catechetical Lectures (New Advent)