2 For he who makes use of tongues is not talking to men but to God; because no one has the sense of what he is saying; but in the Spirit he is talking of secret things. 3 But the word of the prophet gives men knowledge and comfort and strength. 4 He who makes use of tongues may do good to himself; but he who gives the prophet's word does good to the church.
Matthew Henry's Commentary on 1 Corinthians 14:2-4
Commentary on 1 Corinthians 14:1-5
(Read 1 Corinthians 14:1-5)
Prophesying, that is, explaining Scripture, is compared with speaking with tongues. This drew attention, more than the plain interpretation of Scripture; it gratified pride more, but promoted the purposes of Christian charity less; it would not equally do good to the souls of men. What cannot be understood, never can edify. No advantage can be reaped from the most excellent discourses, if delivered in language such as the hearers cannot speak or understand. Every ability or possession is valuable in proportion to its usefulness. Even fervent, spiritual affection must be governed by the exercise of the understanding, else men will disgrace the truths they profess to promote.