Praying in Tongues: 1 Corinthians 14:14-15

 

 For if I pray [in] tongues my spirit prays but my understanding is unfruitful What is it then I will pray with the spirit and I will pray with the understanding[1]

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[1] Since praying in the Spirit is not the same as praying with our understanding Romans 8:26, we can infer from this verse, that praying in the Spirit is praying in tongues. Jude wrote that one of the benefits of praying in the Spirit is that our faith is built up Jude :20. 

This is an excerpt from The Hungry Hearts Bible Commentary