Speaking in tongues is a sign for unbelievers. For believers, the sign is prophecy. Yet today, many churches and pastors treat tongues as if it were the definitive proof of receiving the Holy Spirit. But in truth, according to the Bible, tongues are a sign given to unbelievers. In other words, it is given to those who do not have true faith in the love of the cross and Christ, so that they may come to believe fully in the living God.