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In verse 20, Paul said, “In regard to evil be infants...” Paul was actually saying, “in regard to evil desires and evil motives, I want you be like infants, innocent of thinking evil, incapable of doing evil.”
Infants (babies) don’t know evil and don’t do evil. We know evil exists and many people do evil things. But we rather be like infants, don’t want to have evil desires and evil motives in our heart. Memorize 1 Corinthians 14:20 B (second part).
1 Corinthians 14:20 B: In regard to evil be infants, but in your thinking be adults.