The Apostle Paul
1 Corinthians 14:19ESV·traditional attribution

Nevertheless, in church I would rather speak five words with my mind in order to instruct others, than ten thousand words in a tongue.

John Calvin Reformed @genevareformer

19. I would rather speak five words. This is spoken hyperbolically, unless you understand five words, as meaning five sentences. Now as Paul, who might otherwise have exulted loftily in his power of speaking with tongues, voluntarily abstains from it, and, without any show, aims at edification exclusively, he reproves, by this means, the empty ambition of those, that are eagerly desirous to show themselves off with empty tinkling.

Matthew Henry Presbyterian @wholebiblehenry

The apostle here sums up the argument hitherto, and, I. Directs them how they should sing and pray in public (Co1 14:15): What is it then? I will pray with the spirit, and I will pray with the understanding also. I will sing with the spirit, etc.

Commenting on 1 Corinthians 14:15-20

John Gill Reformed Baptist @doctorgill

Brethren, be not children in understanding,.... There are some things in children in which it is reproachful for believers to be like them; as nonproficiency in knowledge, want of capacity to receive, bear, and digest strong meat; levity, fickleness, and inconstancy, unskilfulness in the word, deficiency of knowledge, want of understanding, not of things natural, but spiritual and evangelical; which is the more aggravated, since...