Those who speak in strange tongues help only themselves, but those who proclaim God's message help the whole church.

In the Scriptures it is written, "By means of people speaking strange languages I will speak to my people, says the Lord. I will speak through lips of foreigners, but even then my people will not listen to me."

So then, the gift of speaking in strange tongues is proof for unbelievers, not for believers, while the gift of proclaiming God's message is proof for believers, not for unbelievers.