1 Corinthians 14:12-15
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12 Even so ye, forasmuch as ye are zealous of spiritual gifts, seek that ye may excel to the edifying of the church.
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13 Wherefore let him that speaketh in an unknown tongue pray that he may interpret.
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14 For if I pray in an unknown tongue, my spirit prayeth, but my understanding is unfruitful.
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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.