There is one line in the gospel today that is very important, and yet it's very easy for us to overlook it. Jesus tells his disciples and is telling us that Jesus has many things that we need to know. He was speaking to the disciples at the Last Supper Many things that they had to know, but they couldn't hear them all now, so that is why Jesus tells them, "I will send you the holy spirit and the spirit will make known to you all that has been revealed to me."
Now when we think of the Feast of Pentecost, we think of it as an event that was extraordinary, of course, but we think of it as an event that is over. It happened that one time; 50 days after Easter, the whole community was gathered together in the upper room. They were living in fear and doubt, not knowing what to do. Then there was the extraordinary experience that St. Luke describes in the Acts of the Apostles, and he makes it very clear that this is something special.