1 Corinthians 14:20-22

Amplified Bible, Classic Edition

²⁰ Brethren, do not be children [immature] in your thinking; continue to be babes in [matters of] evil, but in your minds be mature [men].

²¹ It is written in the Law, By men of strange languages and by the lips of foreigners will I speak to this people, and not even then will they listen to Me, says the Lord.^(A)

²² Thus [unknown] tongues are meant for a [supernatural] sign, not for believers but for unbelievers [on the point of believing], while prophecy (inspired preaching and teaching, interpreting the divine will and purpose) is not for unbelievers [on the point of believing] but for believers.