How is it that Moshe Rabbeinu, who received the Torah, spoke with Hashem face to face, and was the leader of Klal Yisrael, was “the most humble person in the world?”
Chazal say that Moshe saw Adam HaRishon’s sefer, which lists all people who will be born and all the things that would happen to them. When he saw the final generation, and all the hardships they will need to go through in ruchniyus and gashmiyus, and still be moser nefesh to keep the mitzvos and serve Hashem, he was humbled. ~ R’ Shalom Ber of Lubavitch