I realize they could have seen but their hearts were dull, callous, insensible, their ears hard of hearing, and their eyes closed so they couldn’t see. That part I do understand. The part I don’t understand is the last part: “…lest at any time they should see with their eyes and hear with their ears, and should understand with their heart and should be converted and I should heal them.” Doesn’t that mean that their ears and eyes could be opened, which would lead them to understand with their heart?

If they were converted, would that mean that they repented and applied God’s law and obeyed Him, and He would heal them? If it isn’t referring to that, then I don’t understand what he was referring to. It sounds like He didn’t want them to understand or change. Would that mean that at times God doesn’t want someone to understand?