1 Corinthians 14:20-22

VIN(i) 20 Brothers, stop thinking like children. In regard to evil be infants, but in your thinking be mature. 21 In the law it is written, "By men of strange tongues and by the lips of foreigners will I speak to this people, and even then they will not listen to me, says the Lord." 22 Tongues, then, are a sign, not for believers, but for unbelievers. Prophecy, however, is for believers, not for unbelievers.