John 12:39-40

They were not able to believe because Isaiah also said [Isa. 6:10],

Romans 9:18

So then, God has pity on whomever He wants to, and He makes stubborn whomever He wants.

2 Thessalonians 2:11-12

And this is the reason that God sends them a strong delusion [to influence them]: It is so that they would believe the lie,

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