Signs for believers and unbelievers

²⁰ Brothers and sisters, don’t be children in your thinking. Be babies when it comes to evil, but in your thinking be grown-ups. ²¹ This is what it says in the law: “I will speak to this people in foreign languages and with the lips of strangers, and even so they won’t listen to me, says the Lord.” ²² So tongues are not meant for believers, but are a warning for unbelievers; while prophecy is not designed for unbelievers, but for those who come to faith.