The earliest followers of Jesus are empowered by God’s Spirit — we dare not forget that “Pentecost” is an act of God — to declare the wonders of God in languages they did not know (Acts 2:1-13). Event is followed by interpretation — and the interpretation is given by Peter who explains what is happening by appealing to Scripture.

His observations: the tongue-speaking is not as a result of wine-drinking; it is instead the act of God and this act of God was prophesied in Joel. This text explains the event as a God-shaped and God-directed event.

” ‘In the last days, God says,
       I will pour out my Spirit on all people.
       Your sons and daughters will prophesy,
       your young men will see visions,
       your old men will dream dreams.

    Even on my servants, both men and women,
       I will pour out my Spirit in those days,
       and they will prophesy

  I will show wonders in the heaven above
       and signs on the earth below,
       blood and fire and billows of smoke.

   The sun will be turned to darkness
       and the moon to blood
       before the coming of the great and glorious day of the Lord.

    And everyone who calls
       on the name of the Lord will be saved.’

1. The event shows we are in the “last days” — the salvation-historical fulfilment.
2. The event shows that God’s Spirit is now given to all — sons and daughters, young and old, men and women.
3. Wonders are being seen and they summon folks to believe — those who
believe will be saved. These wonders indicate cosmic witness to God’s
judgment on earth.