I have spoken in tongues for 26 years. It followed my being baptized in the Holy Spirit.
Among other things, I have seen someone healed when they came forward with an “unspoken prayer request.” I once saw a child delivered from an evil spirit of fear when I prayed in tongues while she was asleep.
No doubt it is the most discussed, maligned, misused, misunderstood, contrversial of God’s spiritual gifts. Could it be because of its power over the kingdom of darkness?