About Speaking in Tongues

What did the First Christians believe about speaking in tongues? It is always risky assuming we know what people think, but we have a pretty impressive body of writing by these folks, and from those writings, we can get an idea of what their experiences were and what they thought about them.Just to clarify: When I speak of the First Christians, I am talking about those Christians who were alive and active when the various books of the New Testament were being written. That puts them all in the first century, and mostly before the fall of Jerusalem.I am