en_tn_condensed/1co/14/20.md

General Information:

Paul tells the Corinthians that people being able to speak in different languages was told ahead of time by the prophet Isaiah, many years before such speaking happened at the start of Christ's church.

do not be children in your thinking

Here "children" is a metaphor for being spiritually immature. Alternate translation: "do not think like children" (See: rc://en/ta/man/jit/figs-metaphor)