It took a while to figure out what you are saying here and I still don't know what you mean "Is this a bad translation?" in the post where you quote Isaiah 6:10.
My point was to respond to your quotation of Isaiah 6:10, with a commentary on that passage that provides context. When there seem to be contradictions, I like to shake the box by looking at various Bible commentaries. Just felt like posting this:
Hebrews 11:6 But without faith it is impossible to please Him, for he who comes to God must believe that He is, and that He is a rewarder of those who diligently seek Him.
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Often those that disagree with Calvinism think it teaches that God does not respond to what people choose. That is not what Calvinism teaches. When they are told it is not what Calvinism teaches, they repeat it, saying that is where Calvinism logically leads. Still, (I repeat), it is not what Calvinism teaches. If their logic takes them there, fine, but don't say Calvinism teaches it, or assume it unsaid, in responding to Calvinism.
(Whole arguments are moot, because of this kind of thinking. I get remonstrated for not responding to the many texts posted showing people choosing, as if Calvinism teaches we don't choose. It does not teach that we don't choose.)
As it turns out, their 'logical extrapolations' of what Calvinism does teach are usually based on false premises, such as the notion that the command necessarily implies the ability to obey, or that the believer's definition/notions concerning "love" are all there is to love; they feel free to extrapolate and contradict scripture, even, (or rather, to reinterpret scripture to align it with their use for "love". Thus, for eg, UR.)
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The context of Isaiah 6:10 doesn't change Isaiah 6:10 nor the point that I was making against what you said concerning Calvin disagreeing with Paul. Calvin did not disagree with Paul. Calvin disagrees with you. You think Calvinism necessarily (whether outright or by implication) teaches that God has no inclination or love for those predestined to reprobation. Yet we teach that God has many characteristic "emotions" that he cannot logically act on yet still bring to pass the project he began with creation: the Bride of Christ, God's Dwelling Place. Christ prayed, so great was his agony of spirit in anticipation of what was about to happen, "if it is possible, let this cup pass" when he well knew it was not possible.
So IN CONTEXT it still shows that God fully intends that their hearts are to be hardened —this being the plan from the beginning.
You said,
"The answer is to be found in the observation that the Lord is not commissioning Isaiah to preach to people who would otherwise be receptive to his message. Rather, in this passage God is responding to the persistent obstinacy of the Israelites." I find this to be very revealing concerning your thinking. Calvinism teaches the very same thing. Yet here you seem to think you have rendered Calvinism's teachings moot, on the matter.
So the same applies with those who are predestined to perdition. They are not willing, so they reject God's message, just as he planned from the beginning. That doesn't mean that God doesn't 'wish' it could be different. But the fact is he uses them as necessary to accomplish his plan.