Looking at the chapter. The most famous section is likely verses 8-9:
Isaiah 55:8-9 KJV 8 For my thoughts are not your thoughts, neither are your ways my ways, saith the LORD. 9 For as the heavens are higher than the earth, so are my ways higher than your ways, and my thoughts than your thoughts.
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Scripture quotations taken from the NASB (New American Standard Bible) Copyright 1995 Copyright by The Lockman Foundation. Used by permission. All rights reserved.