1 Corinthians 14:20

20 Brothers and sisters, stop thinking like children. In regard to evil be infants, but in your thinking be adults.

Read 1 Corinthians 14:20 Using Other Translations

Brethren, be not children in understanding: howbeit in malice be ye children, but in understanding be men.
Brothers, do not be children in your thinking. Be infants in evil, but in your thinking be mature.
Dear brothers and sisters, don’t be childish in your understanding of these things. Be innocent as babies when it comes to evil, but be mature in understanding matters of this kind.