There was once a Yeshiva bochur who became close to Gerrer Chassidus. Before Shavuos his Rosh Yeshiva found out that the boy was not planning to be in Yeshiva but in Ger with his Rebbe the Heilige Beis Yisroel.
The Rosh Yeshiva approached the boy and said "בארג סיני איז דאך דא" - Har Sinai is HERE in Yeshiva [so why are you going to Ger].
The boy sharply replied "בארג סיני איז דאך דא אבער משה רבינו איז דארטן אין גור" - Har Sinai is here but Moshe Rabbeinu [meaning the Tzadik Hador the Beis Yisroel] is in Ger.
The Holy Pnei Menachem loved this story and added that even thought the Jews received the Torah at Har Sinai it didn't prevent them from making an egel hazahav. Had Moshe Rabbeinu been with them he would have stopped them.
May we all be zocheh to cling to Tzaddikei Emes!
[Heard from the Rebbe Shlita]