6 But now, brethren, if I come to you speaking with tongues, what shall I profit you unless I speak to you either by revelation, by knowledge, by prophesying, or by teaching? 7 Even things without life, whether flute or harp, when they make a sound, unless they make a distinction in the sounds, how will it be known what is piped or played? 8 For if the trumpet makes an uncertain sound, who will prepare for battle? 9 So likewise you, unless you utter by the tongue words easy to understand, how will it be known what is spoken? For you will be speaking into the air. (1 Corinthians 14:6–9, NKJV)
Speaking in tongues was a temporary miraculous gift of the Spirit by which one spoke in a foreign language unknown to the speaker but understandable to the hearers (1 Cor. 12:7-11; 13:8). Such a miracle helped spread the gospel to the world (1 Cor. 14:21). Without comprehension, the gift did not edify the listeners (1 Cor. 14:2, 4-5, 11-12, 28). Paul used musical instruments to illustrate the goal of comprehension through clarity (v. 7-8). Then, he made his point that using the gift of tongue-speaking was intended for people to understand the gospel message (v. 9, 7). If it failed to accomplish this, then it was ineffective (even hurtful, 14:23). We want people to understand what we say when we teach God’s word. Let us use “easy to understand” words to promote mature understanding and spiritual strength in those who hear us (v. 9, 18-20, 26).