<p>14:21 <i>In the law it is written: By men of strange tongues and by the lips of strangers will I speak to this people, and not even thus will they hear Me, says the Lord- </i>The New Testament has examples of our being expected to deduce things which at first glance we might find somewhat demanding. 1 Cor. 14:21 rebukes the Corinthians for speaking to each other in languages which their brethren didn&rsquo;t understand. Paul considered that they were immature in their understanding because they hadn&rsquo;t perceived that Is. 28:11,12 states that it will be the Gentile non-believers who will speak to God&rsquo;s people in a language they don&rsquo;t understand. And this experience for Israel was part of their judgment for not having listened to God's prophetic words. So by talking to each other in language they did not understand, the Corinthians were living out their condemnation. Such an argument is subtle, but more powerful than a head on confrontation with them over the fact they were not really speaking in tongues as given by the Spirit, but were just copying the babbling of the mystery cults around them. The argument however presupposes a familiarity with the Hebrew scriptures, which would indicate that they were influenced by Judaizers.</p>