“A millennium ago, I grew envious of my older sister. I hated how the ponies worked hard and dreaded my daytime, but rested and dreamt of things they loved and wanted during her night. Even the foals dreaded the daytime, because they had to work hard at school! Plus, ponies loved her night sky, but every time they admired my daytime sky well, the sun would prevent that.” Princess Celestia explained.
 
“Eventually smoke approached me during my day dreams. The smoke spoke to me, promising that it could help me make ponies love my daytime. In exchange, I would become its queen. By becoming the smokes queen, not only would I be loved by my citizens, but my daylight would be, too. I accepted, and I finally felt powerful. What I didnt realize was, the ponies didnt love me; they feared me and my daylight. I had become corrupt by the smoke, and wanted to destroy my sister to keep the daylight permanent. Thats when she imprisoned me in the sun for 1,000 years using the elements of harmony.”