King James Version (KJV) - 1 Corinthians 14:14 >

For if I pray in an [unknown] tongue, my spirit prayeth, but my understanding is unfruitful.

Textus Receptus (TR) - 1 Corinthians 14:14 >

Ἐὰν γὰρ προσεύχωμαι γλώσσῃ, τὸ πνεῦμά μου προσεύχεται, ὁ δὲ νοῦς μου ἄκαρπός ἐστι.