Isaiah was God’s messenger. Through his message, the wicked became more blind and deaf (they refused to see and hear the truth). But those who honored God gained spiritual sight and hearing (they understood and obeyed; see also Isaiah 29:9–10, 18; 35:5; 42:7, 16–19; 43:8; 56:10; 59:10).
turn and be healed: The Lord was ready to heal those who truly repented, but not those who only wanted to avoid judgment while continuing their sinful ways.