Read: Acts 2
“Men of Israel, hear these words: Jesus of Nazareth, a man attested to you by God with mighty works and wonders and signs that God did through him in your midst, as you yourselves know— this Jesus, delivered up according to the definite plan and foreknowledge of God, you crucified and killed by the hands of lawless men. God raised him up, loosing the pangs of death, because it was not possible for him to be held by it." (Acts 2:22-24 ESV)
By all human accounts and logic, it would seem as though Jesus left the future of human destiny in the hands of eleven men. It would seem. And certainly they each played an epic part. But the apostles are neither the story nor the point of the story—though each were proclaimers of the story.
Peter was a fisherman, who became a follower, who became a leader. He made the eventual transition from fishmonger to fisher-of-men. But there were many bumps on his journey.
Peter made numerous mistakes. He was brash. He was stubborn and dense. He was both an agitator and a coward, a brawler and betrayer. Peter was a tumultuous wreck of a man with only one notable trait among a laundry list of scruples. Peter loved Jesus.
On the day that Luke recorded in the second chapter of Acts, a day often referred to as the Day of Pentecost, Peter changed. Gone was the fumbling disciple and scrambling coward. Peter arose a leader. A preacher. The proclaimer.
Jesus had promised a power would come. And while in person God was with them in limited form, on the Day of Pentecost God revealed himself in a new way. It changed everything. The Holy Spirit emboldened, encouraged, and equipped a once-dull fisherman to stand up before a crowd, in a city full of people that had just murdered his master, and challenge the status quo.
Peter preached Jesus, and thousands responded.