Isaiah 6:9-10 will reveal the irony in God's judgment upon unresponsive Israel. She will not listen to Yahweh. Therefore, having chosen their arrogance, God gives them over to that indifference to Him. They shall be unable to hear Him, see Him, understand Him, or respond to Him with their hearts.
Finally, in verse 12, because they do not want to be close to Him, God will send Israel away from Him, away into exile.