A donkey

[Mvrs]

You can never explain how great it is to be human to a donkey. 
As a donkey you can never explain how great it is to be a donkey to a human. 
As god you will never be able to tell a human how great it is to be a god;)

[Blackhawk]

Fun fact: donkeys are smarter than some humans. Because donkeys cannot be as stupid as some people are. Donkeys can't for example believe in insane conspiracy theories.