I'd just like to say that this certain individual is absolutely correct, and that all of you other fools are just plain idiots. Please, please do me a favor and read what this spell says.
http://www.wowhead.com/?spell=8129#taught-by-npc
"Destroy 13% of the target's mana (up to a maximum of 26% of your own maximum mana). For each mana destroyed in this way, the target takes 0.5 Shadow damage."
Do you know *why* it says "destroy" the target's mana, instead of "drain" the targets mana?
So idiots like you wouldn't make the assumption that resil would affect it. I specifically remember the patch that they changed this to "destroy". Actually, it may have been a hotfix after the patch that made resil affect mana DRAIN from warlocks, and warlocks only.
The fact is, mana BURN (the priest ability in question) is
NOT affected by resil whatsoever. Go ahead and test it if you're so hard-headed.
Good day, and please stop being so ignorant.