"God would speak to Moses face to face, like someone would speak to his friend. Then he would return to the camp. But his attendant, Joshua the son of Nun, a young man, would not leave the tent. Joshua never moved from the tent". Didn't Joshua leave the tent to eat, sleep or attend to his needs? This praise shows that Joshua had complete faith in Moses, the Tzaddik. One who has this faith is cognizant of the tzaddik in everything he does; he remains steadfastly with the tzaddik whatever he does.