[14] For if I pray in an unknown tongue, spirit prayeth, but understanding unfruitful. [15] What then? I will pray with the spirit, and I will pray with the understanding also: I will sing with the spirit, and I will sing with the understanding also. [16] Else when thou shalt bless with the spirit, how shall he that occupieth the room of the unlearned say Amen at thy giving of thanks, seeing he understandeth not what thou sayest? [17] For thou verily givest thanks well, but the other not edified. [18] I thank God, I speak with tongues more than all: [19] Yet in the church I had rather speak five words understanding, that by my voice I might teach others also, than ten thousand words in an unknown tongue.