The Torah, “Exodus” (Ki Tissa),” 33: 11: Then the Lord would speak to Moses face to face, as a man would speak to his companion, and he would return to the camp, but his attendant, Joshua, the son of Nun, a lad, would not depart from the tent.
Those who have already obtained the property of bestowal speak with the Creator as equals because the quality of Bina in its highest point is similar to the Creator (the property of Keter). At that level, they merge with each other.
Joshua doesn’t possess the same powers as Moses to descend to the lowest desires (Malchut), to people, and interact with them there. Joshua remains in the point of merging and that’s why he is called “Moses’s servant.”
Later, Joshua ben Nun enters the land of Israel (“land” derives from the word “Eretz” meaning a “desire,” Malchut) since Malchut is ready to accept the quality of bestowal, whereas Moses is unable to enter the land of Israel because he remains in the pure property of Bina, thus being detached from Malchut. He can correct it, but he is unable to enter it. It will become possible only when the entire land of Israel will be conquered, meaning when Malchut will accept all properties of bestowal and love. Then, the property of Moses will reveal itself.
From KabTV’s “Secrets of the Eternal Book” 9/16/13