Why is understanding the true nature of speaking in tongues important?

The biblical gift of speaking in tongues, as seen during Pentecost, involved believers speaking in known languages to proclaim the gospel to diverse groups (Acts 2:4-11). This contrasts sharply with contemporary practices often seen in modern Pentecostal and charismatic movements, which frequently involve ecstatic utterances lacking interpretability. A proper understanding clarifies that tongues served as a sign gift to authenticate the apostolic message and has ceased following the completion of the New Testament. Recognizing this distinction helps protect believers from misunderstandings and misapplications regarding the Holy Spirit's work today.