Likutei Sichos vol. 20, Vayeira sicha 1
By Shalom Paltiel
The Rebbe Rashab as a young child cried to his grandfather that Hashem doesn’t reveal Himself to him like to Avraham—as he learned in parshas Vayeira. In truth, Hashem already appeared to Avraham in last parsha, so why did the Rashab only cry now?