Brothers, do not be children in your thinking. Be infants in evil, but in your thinking be mature.
20. Brethren, be not children in understanding He proceeds a step farther; for he shows that the Corinthians are so infatuated, that they, of their own accord. draw down upon themselves, and eagerly desire, as though it were a singular benefit, what the Lord threatens that he will send, when he designs to inflict upon his people the severest punishment.
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
In the law it is written,.... In Isa 28:11 for the word law is not be confined to the five books of Moses, but includes all the writings of the Old Testament; and this entirely agrees with the sense of the Jews. Says R. Azarias (q).