Acts 28:25 And when they agreed not among themselves, they departed, after that Paul had spoken one word, Well spake the Holy Ghost by Esaias the prophet unto our fathers,
26 Saying, Go unto this people, and say, Hearing ye shall hear, and shall not understand; and seeing ye shall see, and not perceive:
27 For the heart of this people is waxed gross, and their ears are dull of hearing, and their eyes have they closed; lest they should see with their eyes, and hear with their ears, and understand with their heart, and should be converted, and I should heal them.
28 Be it known therefore unto you, that the salvation of God is sent unto the Gentiles, and that they will hear it.
Because by Acts 28, the entire Jewish nation, both in Jerusalem and the diaspora, have rejected Christ as their Messiah?
So while Paul gave instructions regarding proper usage of tongue speaking in 1 Cor, which was still being written in the transitional period before Acts 28, by the time the pastoral letters of Ephesians onwards were written, no mention of tongue speaking was made by Paul ever again?