I've encountered a lot of confusion, particularly in charismatic communities, about the gift of tongues. I'll try to offer a clarification.
First of all, we have the apostles who spoke in tongues at Pentecost.
They were given this gift that allowed them to be understood by people who spoke various languages who were gathered in Jerusalem. This miracle was a sign that the Church would encompass every culture and people. The Gospel is for everyone.
I hear it all the time "Father, I'm trying to be a good person" or "I am a good person" or "I am not a bad person." It's almost as if people are trying to prove to me that they deserve God's forgiveness.
They say it because they are afraid of the same thing I am afraid of. I think its the deepest fear in Christians today.
We are deeply afraid that Jesus Christ doesn't actually love sinners.