indicates that Paul was not merely speaking from theory in his instructions about other languages and their proper practice in the church. 14:21–22 Drawing on Isa 28:11–12, Paul states that uninterpreted earthly languages serve as a sign of God’s impending “strange work” of judgment to unbelievers (Isa 28:11, 21). In Isa 28, the leaders of Judah rejected as unintelligible nonsense Isaiah’s message that would have given Jerusalem rest from their enemies. 14:23–25 Paul warned the Corinthians that practicing