"Who's a silly pony? You's a silly pony! Who is? You is, Applejack!"
Applejack is the earth pony representing the Element of Harmony, Honesty. She is very hardworking and diligent but, as a consequence, can be stubborn at times. This causes her to believe she needs to do things on her own. But, when she's honest with herself and her friends, they all lend a helping hand and get things done.