God said “have it your way…”
And he said, Go, and tell this people, Hear ye indeed, but understand not; and see ye indeed, but perceive not. Make the heart of this people fat, and make their ears heavy, and shut their eyes; lest they see with their eyes, and hear with their ears, and understand with their heart, and convert, and be healed. (Isaiah 6:9-10 KJV)
God told the Israelites essentially “Have it your way…” God left the Israelite’s to themselves, open to whatever they might desire in their heart. Mankind left unchecked will often desire those things which feed his own flesh, in his natural sinful darkened heart condition, rather than things which feed his spiritual nature. Mankind does not naturally want what God desires for him not having the supernatural Spirit of God working inside of him directing his way.
God closed or cloaked the Israelite’s ears to the Truth of God and shut their eyes from seeing the things of God which are measured according to His perfect and eternal heavenly plumb line. This action by God is a “last resort action” employed in severe spiritual cases where man has again and again chosen to suppress or ignore Him and His will for their life.