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Arcade Fire – You Already Know Lyrics 12 years ago
What I think this song is talking about is depression in the American culture, and the overuse of prescription drugs to solve the problem and not looking at it from your own internal problems and trying to self-help and figure out why you are depressed or sad.

"Sometimes it moves so fast
If you stop to ask
It's already passed
So how can you move so slow?"
This is talking about how it isn't acceptable to sit around and reexamine your life, and you just need to get over it; whereas in reality you need to be able to accept you past instead of just burying it in your mind and pretending it didn't happen.

" She said
"Well how do I know
When I know
When I know?" (You already know)"
Basically, any sadness whatsoever in modern culture is classified as just depression. You just need to take a pill for it and you'll be fine. You don't need to ask why, the answer to any sadness you're experiencing is just depression i.e you already know

All in all "You already know" just means that you shouldn't need to reexamine yourself, but it's used in a sarcastic sense, because the majority of the time you can fix this sadness by looking at yourself and your life and fixing any external and internal problems instead of just taking a pill. (Although this is not always the case, it is the majority of the time)

Just my two cents.

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