In connection with Chof Cheshvan, the birthday of the Rebbe Rashab, the Frierdiker Rebbe related a story of the Baal Yom Huledes which happened when he was a child of 4 or 5 years old on Shabbos Parshas Vayeira.

The Rebbe Rashab went in to his grandfather, the Tzemach Tzedek, crying. He asked “why did Hashem appear Himself to Avraham Avinu, and to us He doesn't appear?”

...From here we can learn a lesson, that especially a child of 4 or 5 years old, literally, we can educate in this manner that he should strongly demand, to the point of crying, that Hashem should appear to him, as He did to Avraham Avinu.

(Likutei Sichos vol. 15, p. 129-30)