God often speaks of doing things himself when in fact he is prophetically stating what will take place. God does not infringe on people's freewill especially in cases where he it proving his sovereignty, yet God made clear statements that HE hardened Pharaoh heart when we know this would actually be contrary to Gods way and working against himself. Likewise, by what is said in Isaiah 6:9,10 God is claiming he will literally harden the hearts of people but rather its God prophetically explaining that his actions to lead his people will fall on deaf ears and unresponsive people.
I think the apostle Paul would agree with me and disagree with you on this one, he did not see the reference of Isaiah 6:10 as claim that God literally blinds the minds of ones whom he actually wants to serve him, since God wants all people turn around from sin and worship him. God does not work against himself, this is something Paul clearly understood.
(Acts 28:23-27) "..They now arranged for a day to meet with him...from morning to evening, he explained the matter to them ...to persuade them about Jesus... Some began to believe the things he said; others would not believe. 25 So because they disagreed with one another, they began to leave, and Paul made this one comment: “The holy spirit aptly spoke through Isaiah the prophet to your forefathers, 26 saying, ‘Go to this people and say: “You will indeed hear but by no means understand, and you will indeed look but by no means see. 27 For the heart of this people has grown unreceptive, and with their ears they have heard without response, and they have shut their eyes, so that they might never see with their eyes and hear with their ears and understand with their heart and turn back and I [Jehovah] heal them..”
Paul clearly stated they were the ones who blinded themselves and deafened themselves as they were unresponsive due to their lack of stubbornness.
Again, to claim that God blinds people goes against his very nature and his actions for people to preach to all persons and would mean that God works against himself.
(2 Peter 3:9) "..the Lord is not slow concerning his promise, as some people consider slowness, but he is patient with you because he does not desire anyone to be destroyed but desires all to attain to repentance.."
Scripture speaks for itself.
Let it speak.
In lieu of this, you completely skip over John 12 in favor of your own diversionary dialogue.
Let's show you, first-hand the passages that you thought best to utterly ignore...
John 12.35 - 41
Then Jesus said to them, Yet a little while the Light is with you. Walk while you have the Light, that darkness not overtake you. And the one walking in the darkness does not know where he is going. While you have the Light, believe into the Light, that you may become sons of Light. Jesus spoke these things, and going away He was hidden from them. But though He had done so many miraculous signs before them, they did not believe into Him,so that the Word of Isaiah the prophet might be fulfilled, which he said, "Lord, who has believed our report? And the arm of the Lord, to whom was it revealed?" Isa. 53:1 Because of this they could not believe, because Isaiah said again, "He has blinded their eyes" and "has hardened their heart," "that they might not see with the eyes" and "understand with the heart," "and be converted," "and I should heal them." Isa. 6:10 Isaiah said these things when he saw His glory, and spoke about Him.
So...
Look at what you just missed.
John directly quotes Isaiah, of which declares that Yahweh, THE ARM OF THE LORD, has blinded the eyes and hearts of the people.
Jesus tells you in this passage that it is about HIM, the Arm of God, whom Isaiah saw and wrote about as blinding the eyes and hearts of people.
This is doubly confirmed in the quoted passage from Isaiah, that you failed to quote...
Who has believed our report? And to whom is the arm of Yahweh revealed? Isa 53.1
Isaiah 6
In the year that King Uzziah died, then I saw the Lord sitting on a throne, high and lifted up. And His train filled the temple. Above it stood the seraphs. Each one had six wings; with two he covered his face; and with two he covered his feet; and with two he flew. And one cried to the other and said, Holy, holy, holy is Yahweh of Hosts; all the earth is full of His glory!
And the doorposts shook from the voice of the one who cried; and the house was filled with smoke. Then I said, Woe is me! For I am cut off; for I am a man of unclean lips, and I live amongst a people of unclean lips; for my eyes have seen the King, Yahweh of Hosts. Then one of the seraphs flew to me with a live coal in his hand, snatched with tongs from the altar. And he touched it on my mouth, and said, See, this has touched your lips; and your iniquity is taken away, and your sin is covered.
And I heard the voice of Yahweh, saying, Whom shall I send, and who will go for Us? Then I said, Behold me. Send me! And He said,
Go and say to this people, Hearing you hear, but do not understand; and seeing you see, but do not know. Make the heart of this people fat, and make his ears heavy, and shut his eyes, that he not see with his eyes, and hear with his ears, and understand with his heart, and turn back, and one heals him. Then I said, Until when, O Lord? And He said, Until cities lie desolate without one living in them, and the houses without man, and the land is laid waste, a desolation; and until Jehovah has sent mankind far away, and the desolation in the midst of the land is great. But yet a tenth shall be in it, and it shall return and be consumed like the terebinth and like the oak that in being felled yet has its stump (the holy seed is its stump).
So....no, Satan does not have the power to blind the hearts and minds of the people...but Jesus, as God, most certainly does...