be mature. 21 It is written in the law: By people speaking strange tongues and by the lips of foreigners I will speak to this people, and even so they will not listen to me, says the Lord. 22 Thus, tongues are a sign not for those who believe but for unbelievers, whereas prophecy is not for unbelievers but for those who believe. 23 8 So if the whole church meets in one place and everyone speaks