(6) For (i) if I pray in an [unknown] tongue, my (k) spirit prayeth, but my understanding is (l) unfruitful.
(6) A reason: because it is not sufficient for us to speak so in the congregation that we ourselves worship God in spirit (that is according to the gift which we have received), but we must also be understood of the company, lest that is unprofitable to others which we have spoken.
(i) If I pray, when the church is assembled together, in a strange tongue.
(k) The gift and inspiration which the spirit gives me does its part, but only to myself.
(l) No fruit comes to the church by my prayers.