1 Corinthians 14:13-15

King James Version

¹³ Wherefore let him that speaketh in an unknown tongue pray that he may interpret.

¹⁴ For if I pray in an unknown tongue, my spirit prayeth, but my understanding is unfruitful.

¹⁵ What is it 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.