Mark 4:12

(Quaest. 14, in Matt.) Or else they deserved this, their not understanding, and yet this in itself was done in mercy to them, that they might know their sins, and, being converted, merit pardon.

(Vict. Ant. e Cat. in Marc.) Thus, therefore, they see and they do not see, they hear and do not understand, for their seeing and hearing comes to them from God's grace, but their seeing and not understanding comes to them from their unwillingness to receive grace, and closing their eyes, and pretending that they could not see; neither do they acquiesce in what was said, and so are not changed as to their sins by hearing and seeing, but rather are made worse.

For it was God Who made them to see, that is, to understand what is good. But they themselves see not, of their own will making themselves not to see, lest they should be converted and correct themselves, as if they were displeased at their own salvation. It goes on, Lest at any time they should be converted, and their sins be forgiven them. Or we may understand in a different way His speaking to the rest in parables, that seeing they might not perceive, and hearing, not understand. For God gives sight and understanding to men who seek for them, but the rest He blinds, lest it become a greater accusation against them, that though they understood, they did not choose to do what they ought. Wherefore it goes on, Lest at any time they should be, &c.

(Vict. Ant. c Cat. in Marc.) As if He said unto them, You that are worthy to be taught all things which are fitted for teaching, shall learn the manifestation of parables; but I use parables with them who are unworthy to learn, because of their wickedness. For it was right that they who did not hold fast their obedience to that law which they had received, should not have any share in a new teaching, but should be estranged from both; for He showed by the obedience of His disciples, that, on the other hand, the others were become unworthy of mystical doctrine. But afterwards, by bringing in a voice from prophecy, He confounds their wickedness, as having been long before reproved; wherefore it goes on, that seeing they might see, and not perceive, &c. (Isa. 6:9) as if He said, that the prophecy might be fulfilled which foretells these things.

(ubi sup.) To those then who are without, all things are done in parables, that is, both the actions and the words of the Saviour, because neither in those miracles which He was working, nor in those mysteries which He preached, were they able to acknowledge Him as God. Therefore they are not able to attain to the remission of their sins.