1 Corinthians 14:2
2 1For he who speaks in a atongue does not speak to men but to God; for no one hears, but in his bspirit he speaks cmysteries.
21 The apostle's word in vv. 2-6 gives a clear and definite view that speaking in tongues is much less important than prophesying. The apostle strongly belittled the gift of tongues and exalted the gift of prophecy because his main concern was the church, not the individual believers. Speaking in tongues, even if it is genuine and proper, edifies only the speaker himself, but prophesying builds up the church. To prophesy in revelation or to teach in knowledge with clear, understandable words is more profitable to the church than to speak in tongues with unknown words (v. 19).