Joel reflects on the "Day of the Lord" and how true repentance will bring about the great restoration hoped for in the other prophetic books.
The Book of Joel accounts for justice over evil in a form that's unique to the other Old Testament prophets. Unlike the other Books, Joel tells us a story about a terrible plague of locusts that seems to traverse across time.
No room for evil
No particular mention of Israel's sins is present in the book, but the consequences of the terrible events described are certainly clear: God will one day wipe out all evil and start creation over. But through this destruction also comes eternal protection for those who believe in Him.
Salvation from the Messianic King is once again prophesied, but this time the Holy Spirit is prophesied to come too, causing seemingly ordinary people to have visions, divine dreams, and be filled with God's Spirit. That's exactly what happened during Pentecost to Jesus' disciples after His death and resurrection, ensuring us that the Day of the Lord is even closer at hand today.
The Locust Swarm
Joel tells of a past locust plague in Israel and describes its detailed devastation like that of a destruction with weapons.
The Day of the Lord
The Day of the Lord is defined as when God will defeat all evil for good and save His people. Israel's past becomes our future.
Joel urges people to give their hearts to God while there's time. If they turn to Him on the Lord's Day they will be spared.
God's Spirit on All
God will pour out His Spirit upon people in the last days. This is fulfilled centuries later on Pentecost after Jesus' death, resurrection and ascension.
A New Eden
God's people won't be the only ones restored in the future - the earth gets renewed too. God will heal creation into a new Eden.