the bible speaks many times about this phenomenon, in different ways. for example, see the "strong delusion" spoken of in 2 thessalonians 2:11; in that case, it is god himself who sends the delusion. why? so that "all might be damned who believed not the truth, but had pleasure in unrighteousness." (verse 12.) there are also many scriptural instances where the speaker says something to the effect of "he who has eyes to see, let him see." etc. jesus himself, when asked by his disciples why he spoke in parables, said he did it so that only certain people would understand and be saved! (matthew 13:9-17, pic related)
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