Even though Judah was not like the apostate nation of Israel in the north, they had wandered from God. They too needed to be warned of impending judgment. But through this we learn about the prophetic hope in the judgment of God against every evil, which oppresses all mankind. The day of the Lord will be terrible, for God's wrath is not to be taken lightly. But in wrath, God remembers mercy, so it will also be a day of salvation for all from any nation who would put their trust in God.