Moses loved God he let Him use him for a great purpose.
Moses’ chief interests were in Jehovah’s name and His people. Consequently he was not one to seek glory or position. When Jehovah’s spirit came upon certain men in the camp and they began to act as prophets, Moses’ assistant Joshua wanted to restrain them, evidently because he felt that they were detracting from Moses’ glory and authority. But Moses replied: “Are you feeling jealous for me? No, I wish that all of Jehovah’s people were prophets, because Jehovah would put his spirit upon them!”—Nu 11:24-29.
Moses repeatedly pointed to Jehovah, and not himself, as the real Leader. When the people began to complain about food, Moses told them: “Your murmurings are not against us [Moses and Aaron], but against Jehovah.” (Ex 16:3, 6-8) Possibly because Miriam felt her prominence might be eclipsed by the presence of Moses’ wife, she and Aaron jealously and disrespectfully began to speak against Moses and his authority. The record shows that their speech was all the more contemptible because it is at this point that it says:
“The man Moses was by far the meekest of all the men who were upon the surface of the ground.” Moses apparently was hesitant to assert himself, meekly enduring the abuse. But Jehovah was incensed at this challenge, which was actually an affront to Jehovah himself. He took up the issue and severely chastised Miriam. Moses’ love for his sister moved him to intercede for her, crying out: “O God, please! Heal her, please!”—Nu 12:1-15.