I can't say I believe this today...
However, from a purely biblical standpoint: Paul wrote in 1st Corinthians 14:5 that speaking in tongues should be done when there is an interpreter so that the entire congregation will be edified as well.
Speaking in tongues is not a "selfish" gift to be kept to yourself.
The bible also says that speaking in tongues comes from the Holy Spirit. What people forget is that the devil has the power to imitate God and his gifts. You must go back to the Word for verification, and beware of imposters.