Yeah my fiance did the same thing and is yet to find the actual source (the heart of the quote, with a glowing light? pfff). Unfortunately, he also reckons it's not from one of the writers because, as he puts it, "First, it's not written by someone who writes like a writer. Second, I assume a Lost writer would know how to spell Rousseau's name, rather than "Roussou." And third, he claims that the people from later seasons who are missing from the Church scene are missing because "the scene was written right after the pilot and they never changed it so only characters from season one are in there." Yes, except for Juliet, Penny and Desmond, who are all series 2 or 3. Don't fall for it."
For me, though, I don't really care, because the points the person brings up are still good things to mull over. I personally didn't give any extra "oh that MUST be the way it is because he's a writer" so it doesn't really change anything for me.