וְהָאִישׁ מֹשֶׁׁה ענו מְאֹד מִכֹל הָאָדָם אֲשֶׁׁר עַל־פְנֵי הָאֲדָמָה
"And the man Moshe was exceedingly humble more than any man on the face of the earth."
Tosfos explains that there is a difference in usage of the word אדם and האדם, which both mean man. אדם refers to the Jewish people and the side of Holiness. The word האדם includes idolaters.
The mission of Tzadikim in this world is to remove the forces of impurity and negativity in order for the name of Hashem to be manifest within the world. As long as the forces of impurity and the influence of those who go against the will of Hashem is still present in the world, the glory of Hashem cannot rest.
Throughout his life, Moshe was pained. He wished to eradicate the reign of the forces of impurity and usher in the final redemption when Hashem alone shall rule forever. However the time was not yet right and Moshe was unable to achieve his wish. Moshe attributed his inability to remove the forces of negativity to himself, that he was somehow deficient and not worthy enough.
This is alluded to in the inner meaning of the verse וְהָאִישׁ מֹשֶׁׁה ענו מְאֹד מִכֹל הָאָדָם אֲשֶׁׁר עַל־פְנֵי הָאֲדָמָה. Why was the man Moshe exceedingly humble? Because of מִכֹל הָאָדָם אֲשֶׁׁר עַל־פְנֵי הָאֲדָמָה - the fact that impurity (האדם) was still on the face of the earth and had not yet been eradicated.
Ultimately, in the time of Moshiach, the forces of negativity will be forever removed and Hashem alone will rule. Then Moshe will be the Moshiach as alluded to in our Shabbos Amidah with the words ישמח משה, Moshe will rejoice. The word ישמח has the same letters as משיח - Moshiach.
