And they were all filled with the Holy Ghost, and began to speak with (c) other tongues, as the (d) Spirit gave them utterance.
(c) He calls them "other tongues" which were not the same as the apostles commonly used, and Mark calls them "new tongues".
(d) By this we understand that the apostles were not speaking one language and then another by chance at random, or as eccentric men used to do, but that they kept in mind the languages of their hearers: and to be short, that they only spoke as the Holy Spirit directed them to speak.