“hear, yes, hear...see, yes, see.” This is a translation of the figure of speech polyptoton that occurs in the Hebrew text (cp. Bullinger, Figures of Speech Used in the Bible). The Hebrew reads more literally, “Hear! Hear but not understand. See! See but not perceive.” The figure emphasizes the fact that the proud and arrogant people were in fact hearing the truth and seeing God work, but were so hardhearted that they would not (indeed, some of them could not) really hear what they were hearing or see what they were seeing.
Isaiah 6:9-10 is a very solemn section of Scripture and a stern warning to those who value things in this life so much that they ignore or defy God. This prophecy occurs in whole or in part five more times in Scripture, for a total of six times (Matt. 23:14-15; Mark 4:12; Luke 8:10; John 12:40; Acts 28:26-27), and this repetition greatly emphasizes how serious in God’s eyes it is when people continue in their stubborn refusal to believe and obey God. The Bible is clear that the wages of sin is death (Rom. 6:23), and God does not want anyone to die (Ezek. 18:30-32; 33:11), but wants all people to be saved (1 Tim. 2:4). Nevertheless, if people choose death, God will honor their choice and allow them to die in the Lake of Fire (Rev. 20:13-15). [For more on polyptoton and the way it is translated in this verse, see commentary on Genesis 2:16].