²⁰ Brothers, do not be children in your thinking, but be like babies in regard to evil, and be mature in your thinking. ²¹ It is written in the law, “By different tongues and by foreign lips I will speak to this people, and even so, they will not listen to me, says the Lord.”^{[a] 22} Therefore, tongues are a sign meant for unbelievers, not believers, whereas prophecy is for believers, not unbelievers.