@Twilight_Shimmer  
“Begone, Satan!” (Latin)

Celestia walk on the room and see the earth pony holding a solar cross against her sister.  
Celestia: WHAT IS THE MEANING OF THIS? THIS IS MY LITTLE SISTER YOU TREAD WITH THIS!  
the earth pony be confused and he see Luna hided between the legs of Celestia and cry.  
earth pony: What? she you sister but she the embodiment of the night and night is evil!  
Celestia: WRONG! the Night or the Day are Not good or evil but Many Evil hided in the beautiful night of lovely little sister who is too young to make the difference between Good and evil…yet(she try make stop luna crying) Luna only try be friend, Plus many Evil dream to kidnap her make evil!  
The earth pony see tear and fear on the face of Sun goddess Princess.  
Celestia: So is Your Duty of You all other loyal subject to make Sure is never come true, those a choice Evil side and believe I am a tyrant will try to take my sister and make her their Evil queen, please make sure is never come true…I don’t want to kill my only family..my own flesh and blood family!  
Celestia take luna putt her on her back and go to her room.  
Earth pony:….I think i to tell other of never make own sun goddess mad or sad!  
He think of if he fail to protect luna and become evil, he see himself be the first to be kill by her anger or be executed for fail the sun goddess for not protect her sister from all type a tread.  
Earth pony: Ok i better warning the other for not make the same mistake!  
he laugh like a idiot of if fail or other fail to do their duty and what fate wait them.

whats he saying

Adolebitque in Infernum, Sol cultricem.

awww sadly!