Jesus quoted Isaiah 6:9-10 where God told His prophet that widespread unbelief and consequent divine heart-hardening would be what he would experience in his ministry. The context of the Isaiah passage explained that Israel"s hardness would continue until the land lay in ruins. The Exile was not the complete fulfillment of this prophecy. The hardhearted condition was still present in Jesus" day and, we might add, even today. Most Jews will remain generally unresponsive until their land is desolate in the Tribulation, but they will turn to the Lord when He returns to earth at His second coming ( Zechariah 12:10-14; Romans 11:25-26). The word "lest" (NASB) or "otherwise" (NIV) in the middle of Matthew 13:15 probably indicates God"s judicial hardening of the Jews" hearts (cf. 2 Thessalonians 2:11). [source][source][source]