Believe it or not, there's actually people out there who believe that if you're not praying in tongues, you're not saved. According to the father of the word-faith movement, Kenneth Hagin, "peaking in tongues is the initial evidence of the infilling of the Holy Spirit." So if you're not speaking in tongues, you're not filled with the Holy Spirit.
He goes on to say that continuing to pray and to worship God in tongues helps us to be ever-conscious of His indwelling Presence. And if you are conscious of the indwelling Presence of the Holy Ghost every day, that is bound to affect the way you think and live... When you pray in tongues, your spirit is in direct contact with God, who is a Spirit. When you speak in tongues, you are talking to Him by divine, supernatural means.
Is this true? Is this biblical? The answer is "of course not". These quotes came from the NAR's own Kenneth Hagin who has said a lot of silly things, the least of which is his false teachings on praying in tongues