Usually, when we read the story of Pentecost, we encounter two big problems. The first is pronouncing all these names! If you're a lector, this is the reading that will give you nightmares!
But the second problem is that when we read this story, we're usually tempted to see Pentecost as an event in which God's Holy Spirit gives the first disciples an incredibly miraculous gift that even they never get again. And it reinforces the notion that gifts of the Spirit are only rare, mystical and ecstatic abilities that defy explanation and even often defy even the laws of time, space and physics!
And so many of us are tempted to read this story and think, "Wow! If I had mystical gifts like that, I could really do something meaningful. I could really make a difference. But I don't, so I don't figure that this really has much to do with me."
The thing is though, this story really isn't about the disciples or their abilities at all. All they do is talk! In fact, although Luke describes them as "speaking in other languages" the sense is that they're just speaking in their own language, but the Holy Spirit makes it possible for everyone to hear them in their own language. (It really is kind of like the Spirit acting as Google Translate - except it works better!)
The miracle really isn't about the disciples getting a miraculous gift. The miracle is what God does when the disciples use a gift God has already given them - the gift of simply opening their mouths and talking about what they already know...
What the disciples learn, or at least what they should learn, is not that they need special, extraordinary powers to make a difference. Instead, what they're supposed to learn is that God can do incredible things when they use the gifts God has already given them.
The gifts they already have are important. And they can make a significant difference in the lives of others. And even though this kind of "speaking in tongues" with flames above their heads doesn't happen again, what the Pentecost story makes clear to them is that the Holy Spirit can and will do extraordinary things with them and through them when they: