"read in peace" where we'd expect "rest in peace. I'm guessing that this expression was intentional, given that Aaron was a voracious reader, and considering the eloquence of the postscript[0].
This is the first time I've read any message from Anonymous (and my understanding is that there is no "one" Anonymous organization, but rather a loose collection of fragmented groups), but I am quite impressed by the author's command of the English language.
[0] Postscript: We tender apologies to the administrators at MIT for this temporary use of their websites. We understand that it is a time of soul-searching for all those within this great institution as much — perhaps for some involved even more so — than it is for the greater internet community. We do not consign blame or responsibility upon MIT for what has happened, but call for all those feel heavy-hearted in their proximity to this awful loss to acknowledge instead the responsibility they have — that we all have — to build and safeguard a future that would make Aaron proud, and honour the ideals and dedication that burnt so brightly within him by embodying them in thought and word and action.
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edit: it also seems that the closing line, "You were the best of us; may you yet bring out the best in us." is an original phrase by the author? (a quick google search didn't yield any prominent matches) It is a beautiful line.