Acts 2:38 And Peter said to them, “Repent and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit.
In Christ, the many promises of God to His people, the Jews, came to pass. He encompassed all that God had chosen to reveal to man. In the Holy Spirit then, all of the promises of Christ to His people, the Christians, were fulfilled. Jesus had told His followers to go and wait for Him after He had resurrected and reappeared to them. He promised if they waited they would receive power.
And so they waited. They hid, really. They were all together in one place on that day, the day of Pentecost. And when they received the Holy Spirit they all were given the power to speak in languages they didn’t know, for the purpose of evangelizing to others in his/her own tongue. Those who heard them were amazed that these uneducated men were able to speak many languages. Some scoffed, some mocked…but they listened.
As they listened, the previously timid disciples who were in hiding boldly came out among them and preached the gospel. Peter delivered a sermon that brought around 3,000 to Christ that day. It wasn’t a “here’s how to get a better life” sermon, or even a “Jesus loves you” speech. Peter simply pointed to the truth through events that had taken place and then let the conviction of the Holy Spirit do its work in the hearts of the people. They heard it and were “cut to the heart” (Acts 2:37). Then Peter gave them a chance to respond, which they did.
The work of the Holy Spirit in believers on Pentecost is the same power He employs today in us. Things may not always be so drastic as to see thousands of people saved in one moment, but His conviction in their hearts and His work in us to be bold in speaking the truth is still very real, just as it was for Peter and the eleven. He may not ever urge you to speak in tongues or to preach in front of a massive crowd, but He will empower you to do God’s will in whatever situation you do find yourself in.
To God be the glory.