en_tn_condensed/1co/14/20.md

General Information:

Paul tells them that speaking in different languages was told ahead of time by the prophet Isaiah many years before this speaking in other languages 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/translate/figs-metaphor)