I will show wonders in the heavens above and signs on the earth below, blood and fire and billows of smoke.
The great day of the Lord spans the whole kingdom of Christ, beginning at the gospel's first preaching and reaching to the last resurrection, not confined to Pentecost or only to the end. When the prophet speaks of sun turned to darkness and moon to blood, he uses figurative speech to show that God will display tokens of His wrath through all creation, turning even the heavens into messengers of His displeasure.
AI summary
Peter stood up with the eleven to silence the mockers and show he was no drunkard. His sermon alone is recorded, but all the hundred and twenty likely preached too; three thousand were converted that day. Mark this: he who once denied Christ in fear now confesses Him with a courage that proves his full recovery and restoration to God's favor.
AI summary
Commenting on Acts 2:14-36
The wonders in heaven likely mean comets and blazing stars, especially that comet shaped like a flaming sword that hung over Jerusalem. The blood, fire, and smoke refer to the actual carnage of war, the burning of the city and temple, and the literal pillars of smoke that would darken the very heavens, not mystical signs but the physical destruction of Jerusalem itself.
AI summary