A.T. Robertson Commentary 1 Corinthians 14:20

"Brethren, be not children in mind: yet in malice be ye babes, but in mind be men." — 1 Corinthians 14:20 (ASV)

Be not children in mind (μη παιδια γινεσθε ταις φρεσιν). "Cease becoming children in your intellects," as some of them evidently were. Cf. Hebrews 5:11–14 for a like complaint of intellectual dulness for being old babies.

In malice be ye babes (τη κακια νηπιαζετε).

Be men (τελειο γινεσθε). Keep on becoming adults in your minds. A noble and a needed command, pertinent today.