Rav Pam said that those that talk in shul, will talk at the Kosel.  Those that talk at the Kosel, will talk in the Bais Hamikdash even after Moshiach comes…Moshiach himself will have to silence the talkers…

Because when you disrespect a shul, you are disrespecting the Bais Hamikdash. ~ R’ Yisroel Reisman, Shlita