Before our Lord ascended to his Father in heaven he told his disciples to wait, to wait for the gift of the Holy Spirit. Around them in Jerusalem people would have been waiting to celebrate Pentecost where they gave thanks for the Law, given to Moses on Mt Sinai. It was a time of celebration, of joy, but for the Church it was something more.
Jesus promised his disciples that he will send ‘the Spirit of truth, who proceeds from the Father, he will bear witness about me. And you will bear witness, because you have been with me from the beginning.’ (Jn 15:26-27 ESV) He also promises that ‘When the Spirit of truth comes, he will guide you into all the truth, for he will not speak on his own authority, but whatever he hears he will speak, and he will declare to you the things that are to come. He will glorify me, for he will take what is mine and declare it to you. All that the Father has is mine; therefore I said that he will take what is mine and declare it to you.’ (Jn 16:13-15 ESV) We know that Jesus speaks the truth, that his promises can be trusted, that he pours his Holy Spirit upon the Church on the day of Pentecost, and continues so to do until he comes in glory as our Saviour and our Judge.
The Apostles have obeyed Jesus’ command, they have waited and prayed, and they are filled with the Holy Spirit, so that they can proclaim the good news of the Kingdom, so that they can make Jesus known, so that people can come to know him and be filled with his love. People are amazed and perplexed, they simply cannot understand what is going on, some people assume that the disciples are drunk. Just as once people called Jesus a drunkard and a glutton because he used to hang around with the wrong sort of people. Instead St Peter can show that what is happening has been prophesied by the prophet Joel, whom he quotes (Acts 2:16-21) to show that Christ, the Word made flesh is the fulfilment of Scripture, it finds its true meaning in and through Him. He can preach Christ crucified and risen, for our salvation: ‘This Jesus God raised up, and of that we all are witnesses’ they have seen and can testify that Jesus is alive. “Let all the house of Israel therefore know for certain that God has made him both Lord and Christ, this Jesus whom you crucified.” (Acts 2:36) Peter and the apostles can confess their faith in Christ and bear witness to him. It has an immediate effect: (Acts 2:37) ‘Now when they heard this they were cut to the heart, and said to Peter and the rest of the apostles, “Brothers, what shall we do?”’ To which Peter replies, ‘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. For the promise is for you and for your children and for all who are far off, everyone whom the Lord our God calls to himself.’ (Acts 2:38-39) This is what the church, you and me are called to proclaim, so that people can come and have new life in Christ. Then we see them all living a recognisable Christian life: ‘And they devoted themselves to the apostles’ teaching and the fellowship, to the breaking of bread and the prayers.’ (Acts 2:42) This is what we are called to be and to do as Christians, to a life where we are close to Christ, in Word and Sacrament, so that we may be strengthened to live the life of faith, and to proclaim the Good News of Jesus Christ so that the world may believe.