I had to edit down the original question. I think that the significance of the discussions between Eliezer and Moishe the Beadle is that both are talking about the nature of being in the world. Eliezer had already been shown as someone who was driven to understand, driven to know more about what had already been accepted as standard truth. Some of their earliest conversations revolved around why Eliezer prays or why he cries during prayer. Eliezer was unable to answer these questions and from this point on, their discussions take a cosmic angle. It is through these discussions that both Eliezer and Moishe the Beadle understand that the true relationship that exists between human beings and the divine rests in the need to ask the questions. The ability to ask questions to God is where the answers can arise. Moishe and Eliezer speak on this level, a sphere in which the most basic questions about human existence prove to be the most difficult to answer. In their discussions, the idea of finding the gate "to the orchard of mystical truth" becomes evident. Finding this specific gate, one of a "thousand and one" that exists, becomes of utmost importance to Eliezer and Moishe is his guide in the process. The significance of their discussion is to further a relationship between Eliezer and the divine, something that was interrupted when "one day all foreign Jews were expelled from Sighet. And Moishe was a foreigner."