The episode where he began to teach a young illiterate man to read made me cry.
Little known fact: he was one of the best voice artists in the world. He had amazing range and created a surprisingly high number of characters, including Cogsworth from Beauty and the Beast, the evil governor from Pocahontas and Joomba from Lilo and Stitch as well as Kamaji (the old man with multiple arms) from Spirited Away.
I didn't get a feel for his voice work until Ric Burns' New York: A Documentary. His narration on that was astoundingly good and for me really made it a superb documentary.