The following infographic was created to describe why the concept of adjective+tongues such as other tongues, strange tongues, and unknown tongues was added to I Corinthians. The results may surprise many observers — the adjective+tongues is an English Bible translation phenomenon that started in the 1500s.
Click on the image for a larger version.
For more information and substantiation of the contents provided in the infographic, please go to The Unknown Tongues in the English Bible.
At the end, the graph demonstrates that Pentecostals and Charismatics have seriously overlooked the historical background of other tongues. The addition of other tongues in I Corinthians in the 1500s was one of the biggest polemic volleys by the Protestants against the Catholic Church. One must keep in mind that most Pentecostal and Charismatic scholars are aware that the other tongues doctrine is a weak one–tenuous to hold on any occasion. They would not argue against the results here. However, the majority of lay persons in these movements are unaware and hold to this doctrine.