Hearing but not understanding
The Old Testament
And He replied: “Go and tell this people, ‘Be ever hearing, but never understanding; be ever seeing, but never perceiving.’”
Isaiah 6:9
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In the New Testament
Although Jesus had performed so many signs in their presence, they still did not believe in Him.
John 12:37
BSB
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At his calling, Isaiah is told that the people will hear but not understand, see but not perceive.
Jesus uses this to explain why he speaks in parables and why many don't accept him. John adds something remarkable (John 12:41): Isaiah said this 'when he saw his glory', and in Isaiah 6 the prophet sees the LORD on the throne. John is saying that Isaiah saw Jesus.