In Acts 2.17, Luke (mis)quotes a prophecy from Joel 2.28:
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.
I was always taught that the Acts version was a prophecy in its own right, predicting what would happen in the very last days before Jesus returned, some time in the future (his future, though maybe not ours.) But it isn’t. Luke, or whoever wrote Acts, is claiming the fulfilment of the prophecy in his own time. He’s not saying,’ this is what will happen at some point in the next few millennia.’ He’s declaring – or he’s making Peter declare – ‘this is what’s happening right now.’ Luke, like all members of the cult in its early days, believed the last days had arrived; God was about to impose his Kingdom on the Earth, in a display of power and glory (Luke 21.27).
The dreams and visions of which Luke speaks were, he believed, happening then, as he was writing. To prove it, he relates numerous dreams and visions in Acts; Stephen’s vision of God and Jesus; Paul’s ‘sighting’ of the risen Christ on the road to Damascus and Peter’s encounter with, erm… a table-cloth to name only a few. Elsewhere, Paul himself refers obliquely the innervision that led to his conversion (Galatians 1.16) and recounts his ‘visit’ to ‘the third heaven’ (2 Corinthians 12.2); he’s kind of embarrassed about this one though – as well he might be – and relates it in the third person.
Luke knows that the new cult is built on dreams and visions. He believes such hallucinations are genuine revelations from God himself. Moreover, Luke tells his readers explicitly and directly in Acts 2.17 that such visions and dreams were how the cult’s founders experienced the risen Jesus. How do we know this is what he means? Because he puts the quotation about young men having visions and old men dreaming dreams into the mouth of Peter. That’s the disciple Peter whom the gospels tell us was one of the first to experience the risen lord. Luke has Peter reveal the nature of that experience. ‘This is how it was for me,’ he confesses. ‘I had a god-given vision, just as the scriptures promise.’
Luke is proud of the fact that the new faith is based on young men’s visions and old men’s dreams. Proud enough to include it in Acts 2.17 and proud enough to make Peter of all people declare it. Christianity owes its existence to these hallucinations and delusions, nothing more.