Joel 2 describes the day of the Lord, the hope and the judgement, the love and the power of God. “The day of the Lord is great and very awesome; who can endure it? Yet even now, declares the Lord, return to me with all your heart… return to the Lord your God, for he is gracious and merciful, slow to anger, and abounding in steadfast love”.
Our God is so merciful, that He will always welcome our return. God had pity on Israel when they returned to Him, and said “I will no more make you a reproach among the nations”. He blessed their harvest, so that Israel would know “that I am the Lord your God and there is none else”.
“Everyone who calls on the name of the Lord shall be saved” is the concluding thought of this chapter. God first loved us, but He expects us to reciprocate that love, to devote our short existence to developing His character and demonstrating that to those around us.