For if I pray in an [unknown] tongue, my spirit prayeth, but my understanding is unfruitful.
Ἐὰν γὰρ προσεύχωμαι γλώσσῃ, τὸ πνεῦμά μου προσεύχεται, ὁ δὲ νοῦς μου ἄκαρπός ἐστι.