We successfully resisted Satan in premortality

"Do not be afraid. We have already successfully resisted the evil one at another time and place. We had a valiant testimony in our premortal state, and we can resist Satan and awaken that testimony again today."

- Elder Robert K. Dellenbach, Of the Seventy, "Hour of Conversion," New Era, Jun 2002
http://www.lds.org/new-era/2002/06/hour-of-conversion?lang=eng

Spirits equal in their creation

"Two days, as we compute the days of Heaven,
Since Michael and his Powers went forth to tame
These disobedient: Sore hath been their fight,
As likeliest was, when two such foes met armed;
For to themselves I left them; and thou knowest,
Equal in their creation they were formed,
Save what sin hath impaired"

- John Milton, Paradise Lost, Book VI, Lines 685-691
(God talking to Christ about the equality of spirits. Emphasis added - that's the part I like)