John Chrysostom
You may argue that if they did not perceive the truth, it was essential for them to open their eyes. Indeed, if their blindness were a natural condition, it would be fitting to seek clarity; however, since their blindness was voluntary and stemmed from their own choices, He did not merely state, “they see not,” but rather, “seeing they see not.” This indicates that their lack of vision was rooted in their own moral decay. They witnessed Him driving out demons and remarked, “He casts out demons by the power of Beelzebul, the prince of demons” (Luke 11:15). They recognized that He guided them towards God and acted in accordance with divine intent, yet proclaimed, “This Man is not from God” (John 9:16). In this way, they contradicted what they had both seen and heard.
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Consequently, Christ declared that He would remove their ability to see and hear. They would gain no benefit from this; in fact, they would face even harsher judgment, not only for disbelieving in Him, but also for deriding, accusing, and slandering Him. Yet, He refrains from highlighting this last point, preferring not to be overly harsh in His condemnation. Initially, He spoke to them plainly without using parables, but as they grew increasingly unwilling to listen, He ultimately began to communicate in parables.